The carboxylic acid which is least acidic strength among is

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p-nitrobenzoic acid

p-methylbenzoic acid

p-chlorobenzoic acid

p-methoxybenzoic acid

answer is D.

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Detailed Solution

Electron donating groups decrease acid strength of benzoic acid and electron withdrawing groups increase acidic strength. Order of $+ I$ effect is $- O M e > - M e$ , so, p-methoxy benzoic acid is weaker acid than p-methylbenzoic acid.

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