Q.

Arrange the following compounds in order of decreasing acidity:

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a

III>I>II>IV

b

IV>III>I>II

c

II>IV>I>III

d

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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Arrange the following compounds in order of decreasing acidity: