Question

Cyanohydrin of which of the following forms lactic acid:

• A. $HCHO$
• B. $CH_3CHO$
• C. $CH_3CH_2CHO$
• D. $CH_3COCH_3$

Answer 1

Answer: (B)

$CH_3CHO$

Answer 2

Cyanohydrin addition increases one $C$-atom in acetaldehyde which on hydrolysis gives lactic acid.