Question:
Aldehyde not showing Cannizzaroâs reaction is:
Aldehyde not showing Cannizzaroâs reaction is:
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The Cannizzaro reaction occurs only with aldehydes lacking an alpha-hydrogen.
Updated On: Apr 22, 2026
- Paraldehyde
- Chloral
- Formaldehyde
- Acetaldehyde
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The Correct Option is D
Solution and Explanation
Step 1: Identifying the Cannizzaro reaction.
The Cannizzaro reaction is a base-catalyzed disproportionation of non-enolizable aldehydes (those lacking an alpha-hydrogen). It produces one molecule of alcohol and one molecule of carboxylic acid.
Step 2: Explanation of the options.
- (1) Paraldehyde: Paraldehyde does undergo Cannizzaro's reaction because it is a non-enolizable aldehyde.
- (2) Chloral: Chloral also undergoes Cannizzaroâs reaction.
- (3) Formaldehyde: Formaldehyde can undergo Cannizzaroâs reaction because it lacks an alpha-hydrogen.
- (4) Acetaldehyde: Acetaldehyde has an alpha-hydrogen and thus cannot undergo Cannizzaroâs reaction.
Step 3: Conclusion.
The correct answer is (4) Acetaldehyde.
The Cannizzaro reaction is a base-catalyzed disproportionation of non-enolizable aldehydes (those lacking an alpha-hydrogen). It produces one molecule of alcohol and one molecule of carboxylic acid.
Step 2: Explanation of the options.
- (1) Paraldehyde: Paraldehyde does undergo Cannizzaro's reaction because it is a non-enolizable aldehyde.
- (2) Chloral: Chloral also undergoes Cannizzaroâs reaction.
- (3) Formaldehyde: Formaldehyde can undergo Cannizzaroâs reaction because it lacks an alpha-hydrogen.
- (4) Acetaldehyde: Acetaldehyde has an alpha-hydrogen and thus cannot undergo Cannizzaroâs reaction.
Step 3: Conclusion.
The correct answer is (4) Acetaldehyde.
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