Question

In this reaction :

CH₃CHO + HCN → CH₃CH(OH)CN + HOH → CH₃CH(OH)COOH

an asymmetric centre is generated. The acid obtained would be

(a) D-isomer

(b) L-isomer

(c) 50% D + 50% L-isomer

(d) 20% D + 80% L-isomer

Answer 1

The correct option is: (c) 50% D + 50% L-isomer

Explanation:

Lactic acid (CH₃CH(OH)COOH) is an optically active compound due to the presence of asymmetric carbon atom. It exists in D-and L-form, the ratio of which is found to be (1 : 1), i.e., a racemic mixture is obtained.