9359alcohols and phenols
TRANSCRIPT
-
8/10/2019 9359alcohols and Phenols
1/42
http://www.cbseguess.com/
Guess Paper 2012
Class XII
Subject ChemistryALCOHOLS AND PHENOLS
Question 11.1:
Classify the following as primary, secondary and tertiary alcohols:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
Answer
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
2/42
http://www.cbseguess.com/
Primary alcohol (i), (ii), (iii)
Secondary alcohol (iv), (v)
Tertiary alcohol (vi)
Question 11.2:
Identify allylic alcohols in the above examples
Answer
The alcohols given in (ii) and (vi) are allylic alcohols
Question 11.3:
!ame the following compo"nds according to I#P$C system
(i)
(ii)
(iii)
(iv)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
3/42
http://www.cbseguess.com/
(v)
Answer
(i)%&Chloromethyl&'&isopropylpentan&&ol
(ii)', &*imethylhexane&, %&diol
(iii)%&+romocyclohexanol
(iv)ex&&en&%&ol
(v)'&+romo&%&methylb"t&'&en&&ol
Question 11.4:
Show how are the following alcohols prepared by the reaction of a s"itable
-rignard reagent on methanal.
(i)
(ii)
Answer
(i)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
4/42
http://www.cbseguess.com/
(ii)
Question 11.5:
/rite str"ct"res of the prod"cts of the following reactions:
(i)
(ii)
(iii)
Answer
(i)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
5/42
http://www.cbseguess.com/
(ii)
(iii)
Question 11.6:
-ive str"ct"res of the prod"cts yo" wo"ld expect when each of the following alcohol reacts
with (a) Cl&0nCl'(b) +r and (c) S1Cl'
(i)+"tan&&ol
(ii)'&2ethylb"tan&'&ol
Answer
(a)
(i)
Primary alcohols do not react appreciably with 3"cas4 reagent (Cl&0nCl') at roomtemperat"re
(ii)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
6/42
http://www.cbseguess.com/
Tertiary alcohols react immediately with 3"cas4 reagent
(b)
(i)
(ii)
(c)
(i)
(ii)
Question 11.7:
Predict the ma5or prod"ct of acid catalysed dehydration of
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
7/42
http://www.cbseguess.com/
(i)&methylcyclohexanol and
(ii)b"tan&&ol
Answer
i
(ii)
Question 11.8:
Orthoandparanitrophenols are more acidic than phenol *raw the resonance str"ct"res of
the corresponding phenoxide ions
Answer
6esonance str"ct"re of the phenoxide ion
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
8/42
http://www.cbseguess.com/
6esonance str"ct"res ofp&nitrophenoxide ion
6esonance str"ct"res of m&nitrophenoxide ion
It can be observed that the presence of nitro gro"ps increases the stability of phenoxide ion
Question 11.9:
/rite the e7"ations involved in the following reactions:
(i)6eimer&Tiemann reaction
(ii)8olbe4s reaction
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
9/42
http://www.cbseguess.com/
Answer
i. Reimer&iema!! reacti"!
ii. #"lbe$s reacti"!
Question 11.10:
/rite the reactions of /illiamson synthesis of 'ðoxy&%&methylpentane starting from ethanol
and %&methylpentan&'&ol
Answer
In /illiamson synthesis, an al9yl halide reacts with an al9oxide ion $lso, it is an S!' reactionIn the reaction, al9yl halides sho"ld be primary having the least steric hindrance ence, anal9yl halide is obtained from ethanol and al9oxide ion from %&methylpentan&'&ol
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
10/42
http://www.cbseguess.com/
Question 11.11:
/hich of the following is an appropriate set of reactants for the preparation of &methoxy&&
nitroben;ene and why.
(i)
(ii)
Answer
Set (ii) is an appropriate set of reactants for the preparation of &methoxy&&nitroben;ene
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
11/42
http://www.cbseguess.com/
In set (i), sodi"m methoxide (C%1!a) is a strong n"cleophile as well as a strong base ence,an elimination reaction predominates over a s"bstit"tion reaction
Question 11.12:
Predict the prod"cts of the following reactions:
(i)
(ii)
(iii)
(iv)
Answer
(i)
(ii)
(iii)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
12/42
http://www.cbseguess.com/
(iv)
Question 11.1:
/rite I#P$C names of the following compo"nds:
(i)
(ii)
(iii)
(iv)
(v)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
13/42
http://www.cbseguess.com/
(vi)
(vii)
(viii)
(i%)
(%)
(%i)
(%ii)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
14/42
http://www.cbseguess.com/
Answer
(i) ', ', &Trimethylpentan&%&ol
(ii) & *iethylphenol
(v) >
-
8/10/2019 9359alcohols and Phenols
15/42
http://www.cbseguess.com/
(vi)'&
-
8/10/2019 9359alcohols and Phenols
16/42
http://www.cbseguess.com/
(vi)
(vii)
(viii)
(i%)
(%)
Question 11.3:
(i)*raw the str"ct"res of all isomeric alcohols of molec"lar form"la C'1 and give their
I#P$C names
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
17/42
http://www.cbseguess.com/
(ii)Classify the isomers of alcohols in 7"estion % (i) as primary, secondary and tertiary
alcohols
Answer
(i) The str"ct"res of all isomeric alcohols of molec"lar form"la, C'1 are shown below:
(a)
Pentan&&ol (?)
(b)
'&2ethylb"tan&&ol (?)
(c)
%&2ethylb"tan&&ol (?)
(&)
', '&*imethylpropan&&ol (?)
(e)
Pentan&'&ol ('?)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
18/42
http://www.cbseguess.com/
(')
%&2ethylb"tan&'&ol ('?)
()
Pentan&%&ol ('?)
(h)
'&2ethylb"tan&'&ol (%?)
(ii) Primary alcohol: Pentan&&ol@ '&2ethylb"tan&&ol@
%&2ethylb"tan&&ol@ ', '>*imethylpropan&&ol
Secondary alcohol: Pentan&'&ol@ %&2ethylb"tan&'&ol@
Pentan&%&ol
Tertiary alcohol: '&methylb"tan&'&ol
Question 11.4:
1 gro"p 1n the
other hand, b"tane does not
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
19/42
http://www.cbseguess.com/
Therefore, extra energy is re7"ired to brea9 hydrogen bonds Aor this reason, propanol has ahigher boiling point than hydrocarbon b"tane
Question 11.5:
$lcohols are comparatively more sol"ble in water than hydrocarbons of comparable molec"lar
masses
-
8/10/2019 9359alcohols and Phenols
20/42
http://www.cbseguess.com/
Question 11.7:
-ive the str"ct"res and I#P$C names of monohydric phenols of molec"lar form"la, CB1
Answer
Question 11.8:
/hile separating a mixt"re of ortho andpara nitrophenols by steam distillation, name the
isomer which will be steam volatile -ive reason
Answer
Intramolec"lar &bonding is present in o&nitrophenol Inp&nitrophenol, the molec"les arestrongly associated d"e to the presence of intermolec"lar bonding ence, o&nitrophenol issteam volatile
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
21/42
http://www.cbseguess.com/
Question 11.9:
-ive the e7"ations of reactions for the preparation of phenol from c"mene
Answer
To prepare phenol, c"mene is first oxidi;ed in the presence of air of c"mene hydro&peroxide
Then, c"mene hydroxide is treated with dil"te acid to prepare phenol and acetone as by&
prod"cts
Question 11.10:
/rite chemical reaction for the preparation of phenol from chloroben;ene
Answer
Chloroben;ene is f"sed with !a1 (at ='% 8 and %'D atm press"re) to prod"ce sodi"mphenoxide, which gives phenol on acidification
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
22/42
http://www.cbseguess.com/
Question 11.11:
/rite the mechanism of hydration of ethene to yield ethanol
Answer
The mechanism of hydration of ethene to form ethanol involves three steps
Step 1
Protonation of ethene to form carbocation by electrophilic attac9 of %1E:
Step 2
!"cleophilic attac9 of water on carbocation:
Step *
*eprotonation to form ethanol:
Question 11.12:
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
23/42
http://www.cbseguess.com/
Fo" are given ben;ene, conc 'S1and !a1 /rite the e7"ations for the preparation of
phenol "sing these reagents
Answer
Question 11.13:
Show how will yo" synthesi;e:
(i)&phenylethanol from a s"itable al9ene
(ii)cyclohexylmethanol "sing an al9yl halide by an S!' reaction
(iii)pentan&&ol "sing a s"itable al9yl halide.
Answer
(i)+y acid&cataly;ed hydration of ethylben;ene (styrene), &phenylethanol can besynthesi;ed
(ii)/hen chloromethylcyclohexane is treated with sodi"m hydroxide, cyclohexylmethanol isobtained
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
24/42
http://www.cbseguess.com/
(iii)/hen &chloropentane is treated with !a1, pentan&&ol is prod"ced
Question 11.14:
-ive two reactions that show the acidic nat"re of phenol Compare acidity of phenol with that
of ethanol
Answer
The acidic nat"re of phenol can be represented by the following two reactions:
(i)Phenol reacts with sodi"m to give sodi"m phenoxide, liberating '
(ii)Phenol reacts with sodi"m hydroxide to give sodi"m phenoxide and water as by&prod"cts
The acidity of phenol is more than that of ethanol This is beca"se after losing a proton, thephenoxide ion "ndergoes resonance and gets stabili;ed whereas ethoxide ion does not
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
25/42
http://www.cbseguess.com/
Question 11.15:
-
8/10/2019 9359alcohols and Phenols
26/42
http://www.cbseguess.com/
Question 11.17:
-ive e7"ations of the following reactions:
(i)1xidation of propan&&ol with al9aline 82n1sol"tion
(ii)+romine in CS'with phenol
(iii)*il"te !1%with phenol
(iv)Treating phenol with chloroform in presence of a7"eo"s !a1
Answer
(i)
(ii)
(iii)
(iv)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
27/42
http://www.cbseguess.com/
Question 11.18:
-
8/10/2019 9359alcohols and Phenols
28/42
http://www.cbseguess.com/
(ii)Reimer+iema!! reacti"!
/hen phenol is treated with chloroform (CCl%) in the presence of sodi"m hydroxide, a >C1
gro"p is introd"ced at the ortho position of the ben;ene ring
This reaction is 9nown as the 6eimer&Tiemann reaction
The intermediate is hydroly;ed in the presence of al9alis to prod"ce salicyclaldehyde
(iii),illiams"! ether sy!thesis
/illiamson ether synthesis is a laboratory method to prepare symmetrical and "nsymmetricalethers by allowing al9yl halides to react with sodi"m al9oxides
This reaction involves S!' attac9 of the al9oxide ion on the al9yl halide +etter res"lts areobtained in case of primary al9yl halides
If the al9yl halide is secondary or tertiary, then elimination competes over s"bstit"tion
(iv)-!symmetrical ether
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
29/42
http://www.cbseguess.com/
$n "nsymmetrical ether is an ether where two gro"ps on the two sides of an oxygen atomdiffer (ie, have an "ne7"al n"mber of carbon atoms) Aor example: ethyl methyl ether(C%>1>C'C%)
Question 11.20:
ow are the following conversions carried o"t.
(i)Propene Propan&'&ol
(ii)+en;yl chloride +en;yl alcohol
(iii)
-
8/10/2019 9359alcohols and Phenols
30/42
http://www.cbseguess.com/
(iv)/hen methyl magnesi"m bromide is treated with propane, an add"ct is the prod"ctwhich gives '&methylpropane&'&ol on hydrolysis
Question 11.21:
!ame the reagents "sed in the following reactions:
(i)1xidation of a primary alcohol to carboxylic acid
(ii)1xidation of a primary alcohol to aldehyde
(iii)+romination of phenol to ',,=&tribromophenol
(iv)+en;yl alcohol to ben;oic acid
(v)*ehydration of propan&'&ol to propene
(vi)+"tan&'&one to b"tan&'&ol
Answer
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
31/42
http://www.cbseguess.com/
(i) $cidified potassi"m permanganate
(ii) Pyridini"m chlorochromate (PCC)
(iii) +romine water
(iv) $cidified potassi"m permanganate
(v) G phosphoric acid
(vi) !a+or 3i$l
Question 11.22:
-ive reason for the higher boiling point of ethanol in comparison to methoxymethane
Answer
-
8/10/2019 9359alcohols and Phenols
32/42
http://www.cbseguess.com/
(iv)
(v)
(vi)
Answer
(i) &
-
8/10/2019 9359alcohols and Phenols
33/42
http://www.cbseguess.com/
(ii)
-
8/10/2019 9359alcohols and Phenols
34/42
http://www.cbseguess.com/
Answer
The reaction of /illiamson synthesis involves S!' attac9 of an al9oxide ion on a primary al9yl
halide
+"t if secondary or tertiary al9yl halides are ta9en in place of primary al9yl halides, thenelimination wo"ld compete over s"bstit"tion $s a res"lt, al9enes wo"ld be prod"ced This isbeca"se al9oxides are n"cleophiles as well as strong bases ence, they react with al9ylhalides, which res"lts in an elimination reaction
Question 11.26:
ow is &propoxypropane synthesised from propan&&ol. /rite mechanism of this reaction
Answer
&propoxypropane can be synthesi;ed from propan&&ol by dehydration
Propan&&ol "ndergoes dehydration in the presence of protic acids (s"ch as 'S1, %P1) togive &propoxypropane
The mechanism of this reaction involves the following three steps:
Step 1 Protonation
Step 2 !"cleophilic attac9
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
35/42
http://www.cbseguess.com/
Step * *eprotonation
Question 11.27:
Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a s"itablemethod -ive reason
Answer
The formation of ethers by dehydration of alcohol is a bimolec"lar reaction (S!') involving theattac9 of an alcohol molec"le on a protonated alcohol molec"le In the method, the al9yl gro"psho"ld be "nhindered In case of secondary or tertiary alcohols, the al9yl gro"p is hindered $sa res"lt, elimination dominates s"bstit"tion ence, in place of ethers, al9enes are formed
Question 11.28:
/rite the e7"ation of the reaction of hydrogen iodide with:
(i)&propoxypropane
(ii)2ethoxyben;ene and
(iii)+en;yl ethyl ether
Answer
(i)
(ii)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
36/42
http://www.cbseguess.com/
(iii)
Question 11.29:
-
8/10/2019 9359alcohols and Phenols
37/42
http://www.cbseguess.com/
(ii)It can also be observed from the resonance str"ct"res that the electron density increasesmore at the ortho and para positions than at the meta position $s a res"lt, the incomings"bstit"ents are directed to the ortho and para positions in the ben;ene ring
Question 11.30:
/rite the mechanism of the reaction of I with methoxymethane
Answer
The mechanism of the reaction of I with methoxymethane involves the following steps:
Step1Protonation of methoxymethane:
Step2 !"cleophilic attac9 of I>:
Step*
/hen I is in excess and the reaction is carried o"t at a high temperat"re, the methanolformed in the second step reacts with another I molec"le and gets converted to methyliodide
Question 11.31:
/rite e7"ations of the following reactions:
(i)Ariedel&Crafts reaction>al9ylation of anisole
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
38/42
http://www.cbseguess.com/
(ii)!itration of anisole
(iii)+romination of anisole in ethanoic acid medi"m
(iv)Ariedel&Craft4s acetylation of anisole
Answer
(i)
(ii)
(iii)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
39/42
http://www.cbseguess.com/
(iv)
Question 11.32:
Show how wo"ld yo" synthesise the following alcohols from appropriate al9enes.
(i)
(ii)
(iii)
(iv)
Answer
The given alcohols can be synthesi;ed by applying 2ar9ovni9ov4s r"le of acid&cataly;edhydration of appropriate al9enes
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
40/42
http://www.cbseguess.com/
(i)
(ii)
(iii)
$cid&cataly;ed hydration of pent&'&ene also prod"ces pentan&'&ol b"t along with pentan&%&ol
Th"s, the first reaction is preferred over the second one to get pentan&'&ol
(iv)
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
41/42
http://www.cbseguess.com/
Question 11.33:
/hen %&methylb"tan&'&ol is treated with +r, the following reaction ta9es
place:
-ive a mechanism for this reaction
(int : The secondary carbocation formed in step II rearranges to a more
stable tertiary carbocation by a hydride ion shift from %rd carbon atom
Answer
The mechanism of the given reaction involves the following steps:
Step 1 Protonation
Step 2Aormation of '? carbocation by the elimination of a water molec"le
Step * 6e&arrangement by the hydride&ion shift
www.cbseguess.comOther Educational Portals
www.icseguess.com | www.ignouguess.com | www.dulife.com | www.magicsense.com |www.niosguess.com | www.iitguess.com
http://www.cbseguess.com/http://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.cbseguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://var/www/apps/conversion/tmp/scratch_1/www.icseguess.com%20%7C%20www.ignouguess.com%20%7C%20www.dulife.com%20%7C%20www.magicsense.com%20%7C%20www.niosguess.com%20%7C%20www.iitguess.comhttp://www.cbseguess.com/ -
8/10/2019 9359alcohols and Phenols
42/42
http://www.cbseguess.com/
Step !"cleophilic attac9
Paper Submitte& /y
ame IS3 -4I
5mail saima!ishtuli6re&i''mail.c"m
Ph"!e ". 728907:89
http://www.cbseguess.com/http://www.cbseguess.com/