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NEET2004ChemistryCarboxylic Acid DerivativesActual

Which of the following has the maximum acidic strength ?

Options

  1. Ap -nitrophenol
  2. Bp-nitrobenzoic acid
  3. Co -nitrobenzoic acid
  4. Dm -nitrobenzoic acid

Correct answer

C. o -nitrobenzoic acid

Step-by-step solution

o -nitrobenzoic acid is the strongest acid among these. - NO ₂ group is a powerful electron withdrawing group and it has most effect when present at o -position. It is also known as o-effect. Due to its electron withdrawing nature electron density on H -atom in -COOH group becomes very less, hence it can be easily donated.

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