Question

The increasing order of the acidity of the following carboxylic acids is :

• A. I < III < II < IV
• B. IV < II < III < I
• C. II < IV < III < I
• D. III < II < IV < I

Answer 1

Answer: (D)

III < II < IV < I

Answer 2

Carboxylic acid having electron withdrawing substituents like $- NO _{2}$ and $- Cl$ increases the acidity whereas electron donating substituents like - OH and $- CH _{y}$ decreases the acidity. Hence, increasing order of acidity is $11 I< II < TV <1$.