The correct order of acid strength of the following compounds is
(I) Phenol (II) p-Cresol (III) m-Nitrophenol (IV) p-Nitrophenol

III > II > I > IV

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IV > III > I > II

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II > IV > I > III

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I > II > IV > III

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Solution

The correct option is B IV > III > I > II
Electron withdrawing group (EWG) increases acidic strength & electron releasing group (ERG) decreases acidic strength.
Therefore, Nitrophenol will be more acidic than phenol & it will be more acidic than cresol.
Among para & meta Nitrophenols, para-nitrophenol will be - $N O_{2}$ group. Hence correct option is (b).

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