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The carboxylic acid of least acidic strength among the following is:-

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The carboxylic acid of least acidic strength among the following is:-
A. p-nitrobenzoic acid
B. p-methylbenzoic acid
C. p-chlorobenzoic acid
D. p-methoxybenzoic acid
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Correct Answer - D
Electron donating groups decrease acid strength of benzoic acid and electron withdrawing groups increase acidic strenth. Order of +I effect is `-OM e gt -Me,` so, p-methoxy benzoic acid is weaker acid than p-methylbenzoic acid.
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