Question

Which among the following substituent group decreases the acidic strength of aromatic carboxylic acid?

Options

• -Cl

• -NH₂

• -CN

• -NO₂

Answer 1

-NH₂ 

Explanation:

-NH₂ is an electron-donating group that makes aromatic carboxylic acids less acidic by exposing the benzene ring to electrophilic assault. The electron-withdrawing groups -Cl, -CN, and -NO₂ increase the acidity of aromatic carboxylic acids.