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Functional Group

Among the fol...

Question

Among the following compounds, the most acidic is :

A

p-nitrophenol

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B

p-hydroxybenzoic acid

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C

o-hydroxybenzoic acid

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D

p-toluic acid

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Solution

The correct option is C o-hydroxybenzoic acid
o-hydroxy benzoic acid is strongest among all.
It is due to a very high stabilization of conjugate base by intramolecular H-bond which outweigh the electron donating resonance effect of -OH

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