NEET 2023 Phase 2 · ChemistryRosenmundPrevious Year Question
The following conversion is known as:
Answer: (B) (B) Rosenmund reaction. \textbf{Answer:} (B) Rosenmund reaction.
- A.(A) Etard reaction
- B.(B) Rosenmund reaction✓
- C.(C) Stephen reaction
- D.(D) Gattermann-Koch reaction
Correct Answer
(B) (B) Rosenmund reaction
Solution & Explanation
\textbf{Answer:} (B) Rosenmund reaction. \textbf{Solution:} Catalytic hydrogenation of an acyl chloride over palladium poisoned with (Rosenmund's catalyst) reduces it only as far as the aldehyde, preventing over-reduction to the alcohol. The conversion of benzoyl chloride to benzaldehyde is therefore the Rosenmund reduction. (Etard: toluene to benzaldehyde; Stephen: nitrile to aldehyde; Gattermann-Koch: arene to aryl aldehyde.)
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