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MHT CET Medical202622 April 2026Evening ShiftChemistryAlcohols Phenols and EthersActual

Which of the following compounds, when treated with acetic anhydride, forms aspirin?

Options

  1. ABenzoic acid
  2. B2-Hydroxybenzoic acid
  3. C2-Methylbenzoic acid
  4. DBenzene-1,2-dicarboxylic acid

Correct answer

B. 2-Hydroxybenzoic acid

Step-by-step solution

Aspirin is chemically known as acetylsalicylic acid. It is prepared by the acetylation of salicylic acid, whose IUPAC name is 2-hydroxybenzoic acid. When 2-hydroxybenzoic acid is treated with acetic anhydride in the presence of an acid catalyst, the phenolic hydroxyl group undergoes acetylation to form acetylsalicylic acid (aspirin) and acetic acid as a byproduct. Therefore, 2-hydroxybenzoic acid forms aspirin when treated with acetic anhydride. Answer: 2-Hydroxybenzoic acid

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