Q35 / 160 · AP EAMCET 2019 (20 Apr Shift 2) · Chemistry
Arrange the following in increasing order of acidic charater.
- AI < II < III < IV
- Correct answerBI < IV < II < III
- CIV < III < II < I
- DII < III < IV < I
Solution
Acidic character $\propto$ stability of conjugate base. tability of anion $\propto-M \propto-I \propto \frac{1}{+I}$
$\propto \frac{1}{\text { Hyperconjugation }}$
Mesomeric effect is more than hyperconjugation and $-M$ effect of $-\mathrm{NO}_2$ will not operate at $m$-position. $\therefore$ Correct order is III $>$ II $>$ IV $>$ I.
Mesomeric effect is more than hyperconjugation and $-M$ effect of $-\mathrm{NO}_2$ will not operate at $m$-position. $\therefore$ Correct order is III $>$ II $>$ IV $>$ I.
Hence, the correct answer is option: 'B'.