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In the following compounds

The order of acidic character is

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

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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.
The resonance effect is effective from the ortho and para positions.However at the ortho position intra molecular hydrogen-bonding weakens the acidic character to a large extent.
Hence the correct order is
Hence (b) is the correct answer.
answered Feb 27, 2014 by sreemathi.v
edited Mar 22, 2014 by balaji.thirumalai
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