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Q. Assertion: $p$-chlorobenzoic acid is stronger acid than benzoic acid.
Reason: Chlorine has electron donating resonance $(+ R )$ effect.

AIIMSAIIMS 2013The p-Block Elements - Part2

Solution:

Chlorine has electron donating resonance effect however its inductive effect $(-I)$ wins over resonance effect and makes it overall electron withdrawing due to which increases the acid strength of benzoic acid.