Question:
Which one of the following compounds gives aspirin on reacting with acetic anhydride in presence of \( H_2SO_4 \)?
Which one of the following compounds gives aspirin on reacting with acetic anhydride in presence of \( H_2SO_4 \)?
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Aspirin is synthesized from salicylic acid (\( \text{COOH} \) group) and acetic anhydride under acidic conditions.
Updated On: Apr 22, 2026
- \( \text{CHO} \)
- \( \text{COOH} \)
- \( \text{OH} \)
- \( \text{NH}_2 \)
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The Correct Option is B
Solution and Explanation
Step 1: Identifying the reaction.
When acetic anhydride reacts with a compound in the presence of sulfuric acid, the reaction forms an ester or an acid derivative. To form aspirin, the carboxylic acid group (\( \text{COOH} \)) on the aromatic ring reacts with the acetic anhydride.
Step 2: Explanation of the options.
- (1) \( \text{CHO} \): This is the aldehyde group, and it does not form aspirin in the given reaction.
- (2) \( \text{COOH} \): This is the correct option. The carboxylic acid group forms aspirin upon reaction with acetic anhydride.
- (3) \( \text{OH} \): This hydroxyl group does not react to form aspirin in the same manner.
- (4) \( \text{NH}_2 \): The amino group does not form aspirin in this reaction.
Step 3: Conclusion.
The correct answer is (2).
When acetic anhydride reacts with a compound in the presence of sulfuric acid, the reaction forms an ester or an acid derivative. To form aspirin, the carboxylic acid group (\( \text{COOH} \)) on the aromatic ring reacts with the acetic anhydride.
Step 2: Explanation of the options.
- (1) \( \text{CHO} \): This is the aldehyde group, and it does not form aspirin in the given reaction.
- (2) \( \text{COOH} \): This is the correct option. The carboxylic acid group forms aspirin upon reaction with acetic anhydride.
- (3) \( \text{OH} \): This hydroxyl group does not react to form aspirin in the same manner.
- (4) \( \text{NH}_2 \): The amino group does not form aspirin in this reaction.
Step 3: Conclusion.
The correct answer is (2).
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