Arrange the following compounds in order of decreasing acidity:

I > I I > I I I > I V

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I I I > I > I I > I V

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I V > I I I > I > I I

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I I > I V > I > I I I

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Solution

The correct option is B $I I I > I > I I > I V$
1) $- I e f f e c t$
2) $+ I e f f e c t$
3) $- M, - I e f f e c t$
4) $+ M e f f e c t$
Both $- M$ and $- I$ effect are more in compound III hence, the correct order of acidic strength is $I I I > I > I I > I V$ .

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