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NCERT Class XII Chemistry
Chapter - Aldehydes, Ketones and Carboxylic Acids
Questions with Solutions

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Question : 11
Total: 28
An organic compound (A) (molecular formula C8H16O2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but-1-ene. Write equations for the reactions involved.
Solution:  
Given :
(i) Compound (A) upon hydrolysis produces one molecule each of a carboxylic acid and alcohol. This indicates that (A) is an ester.
(ii) (C) upon oxidation produces (B) proving that (C) and (B) have same no. of carbon atoms.
(iii) (C) on dehydration produces but-1-ene. This, coupled with the fact that it gives a carboxylic acid (B) on oxidation shows that (C) is a primary alcohol.
∴ (C) is
CH3−CH2−CH2−CH2OH
Butan−1−ol
(B) is
H3C−(CH2)2−COOH
Butanoic‌acid

and hence, (A) is
H3C−(CH2)2−
O
||
C
−O−(CH2)3−CH3
Butyl‌butanaote

The reactions involved may be summarized as :
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