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Among the following compounds, the most acidic is : [JEE-2011] (A) p-nitrophenol (B) p-hydroxybenzoic acid (C) o-hydroxybenzoic acid (D) p-toluic acid

Among the following compounds, the most acidic is : [JEE-2011] (A) p-nitrophenol (B) p-hydroxybenzoic acid (C) o-hydroxybenzoic acid (D) p-toluic acid

Grade:11

1 Answers

Arun
25750 Points
4 years ago
Ortho-isomer, a strong hydrogen bridge can be formed between the phenolic -OH and the the carboxylate anion. This will tend to stabilize the conjugated carboxylate base, and hence will increase acidity.

this is the order of acidic 

ortho hydroxy B.acid > meta hydroxy B.acid > benzoic acid > para hydroxy B. acids

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