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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

1. (a) Acetone
2. (b) Diethyl ketone
3. (c) Formaldehyde
4. (d) Acetaldehyde

Correct answer: (d) Acetaldehyde

Solution

Acetaldehyde reacts with HCN to form a cyanohydrin, which upon hydrolysis gives a racemic mixture of α-hydroxy acid due to the formation of a chiral center.

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