in the attached figure, u can see that the lone-pair over Cl atom is in resonance with the nitro group too, in both the cases...
so its the inductive effect which explains the reactivity, nitro group has an electron-attracting tendency (due to higher electronegativity of N), thus it will decrease the electron density over Cl, and hence making it less reactive...
now if nitro group is nearer the Cl atom, the electron-attracting effect will be more, than if its farther.... so para isomer will be more reactive
Moderation Team
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