Strength of acidity is in order:

I I > I > I I I > I V

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I I I > I V > I > I I

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I > I V > I I I > I V

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I V > I I I > I > I I

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Solution

The correct option is B $I I I > I V > I > I I$
Presence of $- R$ group increases the acidic nature of phenol, whereas presence of $+ R$ group decreases the acidic nature of the phenol.
$- N O_{2}$ is a $- R$ group and $C H_{3}$ is a $+ R$ group. Hence, the correct order is B.

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