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JEE Advanced levelSingle correct optionDifficulty 3 of 3si211

Toluene is oxidised with hot alkaline and then acidified to give A. A is warmed with to give B. B is hydrogenated over Pd/ (poisoned catalyst) to give C. C is shaken with concentrated NaOH solution to give a sodium salt D and a neutral organic compound E. E is

  1. Abenzaldehyde
  2. Btoluene
  3. Cphenylmethanol
  4. Dbenzoic acid

Answer: C

A is benzoic acid, B is benzoyl chloride and C is benzaldehyde (Rosenmund reduction). Benzaldehyde has no alpha hydrogen, so conc. NaOH causes the Cannizzaro reaction: one molecule is oxidised to sodium benzoate (D) and another reduced to (E), the neutral compound.
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