Engineering
Chemistry
Chemical Reaction of Aldehyde and Ketones
Nucleophilic addition
Question

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is :

acetaldehyde
acetone
diethyl ketone
formaldehyde
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Solution

In order to get a Racemic mixture of α-hydroxy carboxylic acid 'A' and 'B' should be different.

As acetal dehyde has a chiral carbon atom having four different groups hence it forms a racemic mixture of α-hydroxy acid. correct option is 'a'.