Question

Chromyl chloride converts methyl group to a chromium complex, which on acid hydrolysis gives corresponding aldehyde. This reaction is called

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

Hint:

The Etard reaction involves chromyl chloride to oxidize a methyl group into an aldehyde.

Answer 1

The Correct Option is C

Step 1: Understanding the reaction.
The Etard reaction involves the conversion of a methyl group into an aldehyde when it reacts with chromyl chloride. This is an oxidation reaction involving chromium as a catalyst.
Step 2: Analyzing the options.
(A) Stephen reaction: Incorrect, this is a reaction of aldehydes with hydrochloric acid.
(B) Wolff-Kishner reaction: Incorrect, this is used for the reduction of carbonyl compounds.
(C) Etard reaction: Correct — The Etard reaction involves chromyl chloride to convert methyl groups into aldehydes.
(D) Rosenmund reaction: Incorrect, this reaction reduces acyl chlorides to aldehydes, not methyl groups.
Step 3: Conclusion.
The correct answer is (C) Etard reaction.