The correct order of reactivity towards nucleophilic substitution reaction for the given compound is:

I > I I > I I I

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I I > I I I > I

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I I > I > I I I

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I I I > I > I I

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Solution

The correct option is D $I I I > I > I I$
Nitro group shows -I and -M both effects when attached to an aromatic system. More the $δ +$ charge at the leaving group, more favourable is the substitution.
(II) is least reactive as $N O_{2}$ is at meta position to $C l$ and -M effect is hindered.
(I) and (III) both experience equal -M effect of $N O_{2}$ but (III) has $N O_{2}$ group nearer to $C l$ so -I effect is more pronounced there. Thus (III) becomes most reactive.

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