Arrange the following acids in increasing order of their acidic strength.
I.
II.
III.
IV.

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IV<III<I<II

I<II<III<IV

III<IV<II<I

IV<III<II<I

answer is C.

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Detailed Solution

Nitro group from para-position increases acidic strength by strong electron withdrawing resonance effect while from meta position by -I-effect only. Hence, I is the strongest acid followed by II. Between III and IV III is stronger acid due to -I-effect of chlorine only but in IY chlorine from para-position donates electron by resonance and withdraw electron by induction, hence weakest acid.

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