Variation of pKa values among benzoic acids

A) Four benzoic acids are in the attached file along with four pKa values. Assign a pKa to each acid, and briefly explain the basis for your order.

b) While o-nitrobenzoic acid and p-nitrobenzoic acid differ significantly in pKa (as seen in part a), o-nitrophenol and p-nitrophenol do not; their pKa's are essentially the same (7.17 and 7.14). Give a brief explanation as to why this would be.

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Solution Summary

Assigning pKa values to benzoic acids and reasons why acids may have similar pKa values.