Arrange the following compounds in order of decreasing acidity:

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$III > I > II > IV$

$IV > III > I > II$

$II > IV > I > III$

$I > II > III > IV$

answer is C.

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Detailed Solution

Electron withdrawing substituents like -NO2,-Cl increase the acidity of phenol while electron releasing substituents like -CH3,-OCH3 decrease acidity. hence the correct order of acidity will be

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