Chemistry · Aldehyde and Ketones: Nature of carbonyl group, nucleophilic addition to >C=O group, relative reactivities of aldehydes and ketones
Cyanohydrin of which compound on hydrolysis will give lactic acid?
Cyanohydrin of which compound on hydrolysis will give lactic acid?
- A. \( C_{6} H_{5} C H O \)
- B. \( H C H O \)
- C. \( C H_{3} C H O \)
- D. \( C H_{3} C H_{2} C H O \)
Step-by-step solution
Lactic acid (CH3CHOHCOOH) is an α-hydroxy acid. Cyanohydrin formation from an aldehyde followed by hydrolysis yields an α-hydroxy acid. To obtain lactic acid, the starting aldehyde must be acetaldehyde (CH3CHO), which after cyanohydrin addition gives CH3CHOHCN, and hydrolysis produces lactic acid. Options A, B, and D give different α-hydroxy acids.
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