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pKa values of substituted benzoic acids

Why is o-Aminobenzoic acid weaker than its meta and para isomers whereas for all other groups that substitute benzoic acid, the ortho isomer is the strongest acid among ortho, meta, para and benzoic acid?

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pKa values of substituted benzoic acids

Why is o-Aminobenzoic acid weaker than its meta and para isomers whereas for all other groups that substitute benzoic acid, the ortho isomer is the strongest acid among ortho, meta, para and benzoic acid?