Question

Arrange the following in decreasing order of acidic character:

Options

• IV > III > I > II

• II > IV > I > III

• I > II > III > IV

• III > I > II > IV

Answer 1

III > I > II > IV

Explanation:

Since –NO₂ and Cl are electron-withdrawing but NO₂ > Cl.

–OCH₃ is more electron releasing due to the +R effect than –CH₃ group, therefore, IV is the least acidic.