Which order is correct for the decreasing reactivity to ring monobromination of the following compounds

$C_{6} H_{5} C H_{3} I, C_{6} H_{5} C O O H I I, C_{6} H_{6} I I I, C_{6} H_{5} N O_{2} I V$

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 I > I I I > I V > I

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I I I > I > I I > I V

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Solution

The correct option is B $I > I I I > I I > I V$
b)
Methyl group activates the benzene ring towards bromination. Whereas electron withdrawing groups like $- C O O H$ and $- N O_{2}$ deactivate the ring.

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