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JEE Main levelSingle correct optionDifficulty 2 of 3o2131

Benzenesulfonic acid is heated with steam in dilute sulfuric acid. The main organic product is

  1. Abenzoic acid
  2. Bbenzene-1,3-disulfonic acid
  3. Cbenzene
  4. Dphenol

Answer: C

Sulfonation is reversible. In hot dilute acid with excess water the equilibrium shifts, and protonation at the ipso carbon followed by loss of (as ) regenerates benzene.
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