Question

Which of the following compounds is the strongest acid?

• A. $HCOOH$
• B. $C{{H}_{3}}COOH$
• C. $C{{l}_{2}}CHCOOH$
• D. ${{C}_{6}}{{H}_{5}}COOH$

Answer 1

Answer: (C)

$C{{l}_{2}}CHCOOH$

Answer 2

Halo acids are stronger acid than parent acids, because halogen atom by its $-I$ effect, weaken the $O-H$ bond of $-COOH$ group.