Q38 / 160 · AP EAMCET 2022 (08 Jul Shift 1) · Chemistry

Arrange the following in increasing order of their acidic strength Figure

  • A
    $\mathrm{A} < \mathrm{C} < \mathrm{D} < \mathrm{B}$
  • B
    $\mathrm{A} < \mathrm{C} < \mathrm{B} < \mathrm{D}$
  • C
    $\mathrm{D} < \mathrm{C} < \mathrm{A} < \mathrm{B}$
  • Correct answer
    D
    $\mathrm{A} < \mathrm{B} < \mathrm{C} < \mathrm{D}$

Solution

More the stability of conjugate bases, more is the acidity of the acid. $\mathrm{Ph}, \mathrm{Br}, \mathrm{NO}_2$ exerts the $-\mathrm{I}$ effect to the $\mathrm{C}_{\propto}$ which, further, stabilizes the carboxylate ion. Order of $(-\mathrm{I})$ effect of the substituents : $\mathrm{H} < \mathrm{Ph} < \mathrm{Br} < \mathrm{NO}_2$

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

Relevant Questions