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Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution.

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When the nucleophile is attached at the carbon carrying -Cl, due to resonance a stabilised intermediate compound is found. As the -NO_{2} is electron withdrawing in nature, the nucleophile will get attached to the benzene ring easily. When the molecule contains more number of -NO_{2}  groups, the nucleophile will be attached more easily. Hence, the order of reactivity is III > II > I.

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