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Which statements are correct? (: benzoic acid 4.20, 4-chlorobenzoic acid 3.98, 2-chlorobenzoic acid 2.94; conjugate acids of amines: aniline 4.6, 2-nitroaniline .)

  1. A2-Methylbenzoic acid is a stronger acid than benzoic acid.
  2. B2-Nitroaniline is a weaker base than aniline in water.
  3. CThe ortho effect in benzoic acids operates only when the ortho group is electron-withdrawing.
  4. D2-Chlorobenzoic acid is a stronger acid than 4-chlorobenzoic acid.

Answer: A, B, D

A: the ortho effect makes any ortho-substituted benzoic acid stronger, even with an electron-releasing methyl group. B: the conjugate acid has against 4.6, so it is a weaker base. C is false because the ortho effect does not depend on the electronic nature of the group. D: 2.94 is lower than 3.98, so true.
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