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MHT CET20255 May 2025Evening ShiftChemistryAldehydes and KetonesActual

Identify the reagent used for Rosenmund reduction.

Options

  1. AH ₂ / Ni
  2. BH ₂ / Pd , BaSO ₄
  3. CNa - Hg / H ₂ O
  4. DSnCl ₂- H ₂ O

Correct answer

B. H ₂ / Pd , BaSO ₄

Step-by-step solution

The Rosenmund reduction selectively converts acyl chlorides to aldehydes using hydrogen gas over palladium on barium sulfate ( H ₂ / Pd , BaSO ₄ ). The barium sulfate serves as a catalyst poison, moderating the palladium's activity to prevent over-reduction to the alcohol. H ₂ / Ni is a standard hydrogenation catalyst, while Na - Hg / H ₂ O and SnCl ₂- H ₂ O are unrelated, being employed in other reduction mechanisms. The correct choice is B .

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