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# In the following compounds

The order of acidic character is

$\begin{array}{1 1}(a)\;(I) < (II) < (III)&(b)\;(II) < (I) < (III)\\(c)\;(III) < (I) < (II)&(d)\;(III) < (II) < (I)\end{array}$

The nitro group is $e^{\ominus}$ with drawing and acid strengthening by both induction and resonance.
The induction operates from all the three positions.Its effectiveness decreases with increasing separation of $NO_2$ and OH.