Question

Which of the following is the strongest carboxylic acid?

• A. \(\text{CH}_3\text{COOH}\)
• B. \(\text{HCOOH}\)
• C. \(\text{CH}_3\text{CH}_2\text{-COOH}\)
• D. \(\text{ClCH}_2\text{COOH}\)

Hint:

An electron withdrawing Cl on the alpha carbon increases acidity.

Answer 1

The Correct Option is D

Step 1: Rule
Acidity rises with -I groups and falls with +I groups.

Step 2: Rank
Propanoic acid < acetic acid < formic acid < chloroacetic acid.

Step 3: Answer
Option (D).

Final Answer:
Option (D). \[ \boxed{\text{ClCH}_2\text{COOH}} \]