Arrange the following in order of decreasing acidic strength. p- nitrophenol (I), p-cresol (II), m-cresol (III), phenol (IV) :

I > II > III > IV

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IV > III > II > I

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I > III > II > IV

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III > II > I > IV

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Solution

The correct option is A I > II > III > IV

The order of decreasing acidic strength is
$p - n i t r o p h e n o l (I) > p - c r e s o l (I I) > m - c r e s o l (I I I) > p h e n o l (I V)$

When an electron withdrawing nitro group is present in para position to $- O H$ group, the acidity is enhanced due to stabilization of phenoxide ion. Hence, p-nitrophenol is most acidic.

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