Q3 of 47 Page 1

p-nitrobenzoic acid has lower pka value than benzoic acid. Why?

Nitro group is an electron withdrawing group. The presence of electron withdrawing group on the phenyl of aromatic carboxylic acid increases their acidity. Due to this p-nitrobenzoic acid (pka= 3.41) has lower pka value than benzoic acid (pka= 4.19)


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