Q19 / 160 · AP EAMCET 2020 (21 Sep Shift 2) · Chemistry

The correct order of decreasing acid strength of following acids is (1) trichloro acetic acid (2) trifluoro acetic acid (3) acetic acid (4) formic acid

  • A
    \(1>2>3>4\)
  • B
    \(1>3>2>4\)
  • Correct answer
    C
    \(2>1>4>3\)
  • D
    \(2>4>3>1\)

Solution

As \(-I\)-effect increases, \(-\mathrm{COOH}\) group becomes more electron deficient and tendency to loose \(\mathrm{H}^{+}\)ions increases i.e., acid strength increases. As \(+I\) effect increases. Acid strength decreases. Thus, correct order of acid strength is : trichloroacetic acid > trifluoroacetic acid > forminc acid > acetic acid. Hence, the correct option is (c).

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

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