Arrange the following in their decreasing order of acidity.
A
III>IV>I>II
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B
I>II>III>IV
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C
IV>III>II>I
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D
II>III>I>IV
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Solution
The correct option is AIII>IV>I>II The decreasing order of acidity is III>IV>I>II. In (III) +I effect of two Me groups makes it most basic In (I) electron-withdrawing effect of the carbonyl group makes it less basic than ammonia. In (II) electron-withdrawing effect of two (C=O) groups makes it least basic.