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ExamsNEETChemistry

In the reaction CH3CHO + HCN → CH3CH(OH)CN →(H2O/H+)→ CH3CH(OH)COOH, an asymmetric centre is generated. The acid obtained would be

  1. (a) 20% D + 80% L-isomer
  2. (b) D-isomer
  3. (c) L-isomer
  4. (d) 50% D + 50% L-isomer

Correct answer: (d) 50% D + 50% L-isomer

Solution

The reaction involves the formation of a chiral center at the carbon atom attached to the hydroxyl group and cyanide group. Since the reaction proceeds via a planar intermediate, equal probabilities exist for the formation of both enantiomers, resulting in a racemic mixture (50% D and 50% L).

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