Question

arrange the following in order of increasing acidity : benzoic acid, p- hydroxy benzoic acid, p- nitro benzoic acid​

Answer 1

Answer:

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Explanation:

Substitution of −OCH

3

on benzoic acid decreases its acidic strength because it is an activating group having +M effect which increases electron density and destabilizes benzoate carbanion. The −NO

2

group has −M effect which withdraws electron density and forms stable benzoate carbanion and makes it a strong acid. Therefore, the order ow acidic strength is p−nitrobenzoicacid>benzoicacid>p−methoxybenzoicacid.