Question

An acyl chloride is hydrogenated over catalyst palladium on barium sulfate to form an aldehyde. This reaction is called as

• A. Stephen reaction
• B. Rosenmund reduction
• C. Etard reaction
• D. Wolff-Kishner reduction

Hint:

The Rosenmund reduction specifically involves the reduction of acyl chlorides to aldehydes using palladium on barium sulfate.

Answer 1

The Correct Option is B

Step 1: Understanding the reaction.
The reaction where acyl chloride is hydrogenated over palladium on barium sulfate to form an aldehyde is known as the Rosenmund reduction. This reaction is used to reduce acyl chlorides to aldehydes.

Step 2: Analyzing the options.
(A) Stephen reaction: This is used to reduce nitriles to aldehydes, not acyl chlorides.
(B) Rosenmund reduction: Correct — This is the reaction that reduces acyl chlorides to aldehydes.
(C) Etard reaction: This reaction is used to form aldehydes from aromatic compounds, not acyl chlorides.
(D) Wolff-Kishner reduction: This is a method used to reduce ketones and aldehydes to alkanes, not acyl chlorides.

Step 3: Conclusion.
The correct answer is (B) Rosenmund reduction, as it is the reaction that reduces acyl chlorides to aldehydes.