Question

The correct order of acid strength of the following carboxylic acids is

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

Answer 1

Answer: (B)

I > II > III > IV

Answer 2

+I effect decreases the acidic character of carboxylic acid and -I effect increases the acidic character. Since the electronegativity order of 'C' attached to carboxylic acid is $sp > sp^2 > sp^3$, hence the order is I > II > III > IV.

Read more from the chapter: Carboxylic Acids