Single Choice

Which of the following is correct with respect to the acidity of benzene sulphonic acid and benzoic acid?

ABenzene sulphonic acid > Benzoic acid
Correct Answer
BBenzene sulphonic acid < Benzoic acid
CBenzene sulphonic acid = Benzoic acid
DNone of the above

Solution

The conjugate base of benzene sulphonic acid has greater resonance stabilization than benzoate ion, hence benzene sulphonic acid is a stronger acid than benzoic acid. $$PhSO^-_3$$ has three equivalent resonance structure, so more stable. but $$PhCOO^-$$ has only two equivalent resonance structure, so less stable.

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