Q24 / 180 · AIIMS 2019 (25 May) · Chemistry

The increasing order of $\mathrm{p} K_a$ values for the following carboxylic acids is (1) acetic acid (2) formic acid (3) benzoic acid (4) trichloroacetic acid

  • Correct answer
    A
    $(4) < (2) < (3) < (1)$
  • B
    $(3) < (1) < (2) < (4)$
  • C
    $(2) < (4) < (3) < (1)$
  • D
    $(3) < (1) < (4) < (2)$

Solution

The order of acidic strength is : trichloroacetic acid $>$ formic acid $>$ benzoic acid $>$ acetic acid. Hence, the increasing order of $\mathrm{p} K_a$ values is : trichloroacetic acid $ < $ formic acid $ < $ benzoic acid $ < $ acetic acid.

Hence, the correct answer is option: 'A'.

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