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Q.

Cyanohydrin of which compound on hydrolysis will give lactic acid? 

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a

CH3CH2CHO

b

 HCHO

c

CH3CHO

d

C6H5CHO 

answer is C.

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Detailed Solution

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Cyanohydrin addition is a type of nucleophilic addition reaction which at first gives cyanohydrin derivative of the carbonyl group and on further hydrolysis gives carboxylic acid. 

Cyanohydrin derivative of acetaldehyde on acidic hydrolysis gives lactic acid. 

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Hence, the correct answer is option (C) CH3CHO.

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