The decreasing order of acidic nature of the following compounds is

The decreasing order of acidic nature of the following compounds is
  1. III $>$ II $>$ I
  2. II $>$ III $>$ I
  3. II $>$ III $>$ II
  4. I $>$ II $>$ III

Solution

) Terminal alkynes contain $s p \mathrm{C}-\mathrm{H}$ group that is acidic in nature. Acidity also depends on the stability of the conjugate base formed.
$-\mathrm{NO}_2$ is electron withdrawing group and therefore decreases the electron density on the carbanion and thus stabilises the conjugate base. $-\mathrm{NH}_2$ is electron donating group and therefore increases the electron density on the carbanion and thus destabilises the conjugate base. Therefore, the acidity order is II $>$ I $>$ III.

Asked in: AP EAMCET 2022 (07 Jul Shift 2)

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