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See, o nitro benzoic acid is more acidic than the para one because of ortho effect. Basically both of them have simliar inductive and resonance features, but ortho effect makes the ortho isomer more acidic.
in meta isomer, only electron withdrawing inductive effect is possible, and resonance is not possible, where as in ortho and para, the NO2 group withdraws electrons both by inductive as well as resonance effects. Hence they are more acidic.
Cheers!
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Moderation Team
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