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  4. The correct order of acid strengths of benzoic acid (X), peroxybenzoic acid (Y) and p-nitrobenzoic acid (Z) is

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Q. The correct order of acid strengths of benzoic acid $(X)$, peroxybenzoic acid $(Y)$ and $p$-nitrobenzoic acid $(Z)$ is

WBJEEWBJEE 2017Aldehydes Ketones and Carboxylic Acids

Solution:

$\because$ In $p$-nitrobenzoic acid $( Z )- NO _{2}$ present as electron withdrawing group, thus is most acidic
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$(X) \because$ Benzoic acid is stabilised via resonance, thus is more acidic than per oxybenzoic acid.
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$(Y) $ peroxy benzoic acid does not show any such resonance.
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Thus is least acidic.
Hence, correct order is $Z > X > Y$.