Question:
Which of the following compounds, when treated with acetic anhydride, forms aspirin?
Which of the following compounds, when treated with acetic anhydride, forms aspirin?
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Aspirin is made by acetylating the phenolic OH group of salicylic acid.
Updated On: Nov 12, 2026
- Benzoic acid
- 2-Hydroxybenzoic acid
- 2-Methylbenzoic acid
- Benzene-1,2-dicarboxylic acid
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Aspirin is acetylsalicylic acid, or 2-acetoxybenzoic acid. It is obtained by acetylation of a phenolic -OH group.
Step 2: Reaction
Salicylic acid reacts with acetic anhydride to give aspirin and acetic acid. The -OH on the ring becomes -OCOCH3.
Step 3: Identify the compound
Salicylic acid is 2-hydroxybenzoic acid. The other options have no phenolic -OH to acetylate.
Final Answer:
2-Hydroxybenzoic acid gives aspirin on treatment with acetic anhydride. \[ \boxed{\text{(B) }\text{2-Hydroxybenzoic acid}} \]
Aspirin is acetylsalicylic acid, or 2-acetoxybenzoic acid. It is obtained by acetylation of a phenolic -OH group.
Step 2: Reaction
Salicylic acid reacts with acetic anhydride to give aspirin and acetic acid. The -OH on the ring becomes -OCOCH3.
Step 3: Identify the compound
Salicylic acid is 2-hydroxybenzoic acid. The other options have no phenolic -OH to acetylate.
Final Answer:
2-Hydroxybenzoic acid gives aspirin on treatment with acetic anhydride. \[ \boxed{\text{(B) }\text{2-Hydroxybenzoic acid}} \]
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