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JEE Main levelSingle correct optionDifficulty 2 of 3ap101

Aqueous is added separately to solutions of phenol, benzoic acid and 2,4,6-trinitrophenol (picric acid, ). Effervescence of is seen with

  1. Abenzoic acid and picric acid only
  2. Bbenzoic acid only
  3. Cphenol and benzoic acid only
  4. Dall three

Answer: A

releases only with acids stronger than carbonic acid (). Benzoic acid () and picric acid () qualify, while phenol () is weaker than carbonic acid and does not.
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