Arrange the following in increasing order of their acidic strength.

I I I < I < I V < I I

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I I < I < I V < I I I

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I < I I I < I V < I I

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I I < I I I < I < I V

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Solution

The correct option is A $I I I < I < I V < I I$
Acidic strength depends on the ability to donate $H^{+}$ easily.
Electron withdrawing groups increase acidic strength while electron releasing groups decrease it. Hence, $II > IV > III < I$.

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