Question:
Both HCHO and CH3CHO give similar reactions with all the reagents except:
Both HCHO and CH3CHO give similar reactions with all the reagents except:
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Formaldehyde reacts with ammonia to form polymeric products, while acetaldehyde does not.
Updated On: Apr 22, 2026
- Schiff reagent
- Fehling solution
- Ammoniacal AgNO3
- Ammonia
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The Correct Option is D
Solution and Explanation
Step 1: Identifying the reactions.
HCHO (formaldehyde) and CH3CHO (acetaldehyde) are both aldehydes and undergo similar reactions with most reagents, but ammonia (NH3) does not react similarly with them.
Step 2: Explanation of the options.
- (1) Schiff reagent: Both formaldehyde and acetaldehyde react with Schiff reagent to give a positive result.
- (2) Fehling solution: Both formaldehyde and acetaldehyde reduce Fehlingâs solution, showing a positive test.
- (3) Ammoniacal AgNO3: Both formaldehyde and acetaldehyde react with ammoniacal silver nitrate to form silver mirrors.
- (4) Ammonia: Ammonia reacts differently with aldehydes. Formaldehyde undergoes polymerization with ammonia, while acetaldehyde does not.
Step 3: Conclusion.
The correct answer is (4) Ammonia.
HCHO (formaldehyde) and CH3CHO (acetaldehyde) are both aldehydes and undergo similar reactions with most reagents, but ammonia (NH3) does not react similarly with them.
Step 2: Explanation of the options.
- (1) Schiff reagent: Both formaldehyde and acetaldehyde react with Schiff reagent to give a positive result.
- (2) Fehling solution: Both formaldehyde and acetaldehyde reduce Fehlingâs solution, showing a positive test.
- (3) Ammoniacal AgNO3: Both formaldehyde and acetaldehyde react with ammoniacal silver nitrate to form silver mirrors.
- (4) Ammonia: Ammonia reacts differently with aldehydes. Formaldehyde undergoes polymerization with ammonia, while acetaldehyde does not.
Step 3: Conclusion.
The correct answer is (4) Ammonia.
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