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JEE Advanced levelSingle correct optionDifficulty 3 of 3ap123

Phenol is treated with , then with (4-7 atm, 400 K), and acidified to give X. X is then heated with ethanoic anhydride in the presence of a few drops of conc. to give Y. Y is

  1. Aphenyl ethanoate
  2. B2-acetoxybenzoic acid (aspirin)
  3. C4-acetoxybenzoic acid
  4. Dmethyl 2-hydroxybenzoate

Answer: B

The Kolbe-Schmidt reaction gives X = 2-hydroxybenzoic acid. Acetylation of the phenolic by ethanoic anhydride converts it into the ester while the carboxylic acid group remains free, giving 2-acetoxybenzoic acid (aspirin).
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