The presence of electron
withdrawing group on the phenyl of aromatic carboxylic acid increases
their acidity while electron donating groups decrease their acidity COOH
OCH3
COOH
COOH
NO2
4-Methoxy
benzoic acid
(p
= 4 46)
Ka
Benzoic acid
(p
= 4 19)
Ka
4-Nitrobenzoic
acid
(p
= 3