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Carbon dioxide is bubbled separately through (I) aqueous sodium phenoxide and (II) aqueous sodium benzoate. Given : 6.4, phenol 10.0, benzoic acid 4.20. Which statement is correct?

  1. A(I) shows no net reaction; (II) gives benzoic acid and
  2. BBoth (I) and (II) give the free acid
  3. C(I) gives phenol and ; (II) shows no net reaction
  4. DNeither reaction occurs because is not acidic

Answer: C

in water behaves as (6.4). It protonates phenoxide because phenol (10.0) is a weaker acid () and gives phenol and bicarbonate. Benzoate is the conjugate base of a stronger acid (4.20), so and no benzoic acid is formed.
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