Question

Rosenmund reduction is used to convert acyl chlorides into:

• A. Alcohols
• B. Carboxylic acids
• C. Aldehydes
• D. Ketones

Hint:

Rosenmund reduction uses a poisoned Pd catalyst to stop at the aldehyde stage during hydrogenation of acyl chlorides.

Answer 1

The Correct Option is C

Rosenmund reaction: \[ \text{RCOCl} \xrightarrow[\text{quinoline}]{\text{H}_2/\text{Pd-BaSO}_4} \text{RCHO} \] - Acid chlorides (acyl chlorides) are reduced to aldehydes using palladium on barium sulfate (a poisoned catalyst), which prevents further reduction to alcohols. Example: \[ \text{CH}_3\text{COCl} \xrightarrow{\text{H}_2/\text{Pd-BaSO}_4} \text{CH}_3\text{CHO} \] Answer: \( \boxed{\text{Aldehydes}} \)