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Arrange the following in increasing order of acidic charater.
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The correct answer is:
I < IV < II < III
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.
$\propto \frac{1}{\text { Hyperconjugation }}$
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.
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