Arrange the following in increasing order of acidic charater.

Arrange the following in increasing order of acidic charater.

1. I < II < III < IV
2. I < IV < II < III
3. IV < III < II < I
4. II < 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.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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