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JEE Advanced levelSingle correct optionDifficulty 3 of 3co101

Benzaldehyde is heated with aqueous-alcoholic KCN to give P. P is treated with in methanol (ketone reduction, then work-up) to give Q. Q is

  1. A1,2-diphenylethanone
  2. B1,2-diphenylethane-1,2-diol
  3. C1,2-diphenylethane-1,2-dione
  4. D2-hydroxy-1,2-diphenylethanone

Answer: B

The benzoin condensation gives P, . reduces the ketone C=O to a secondary alcohol. Q is , 1,2-diphenylethane-1,2-diol.
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