Q. Among the following acids which has the lowest $pK_{a}\$value?
A) $CH_{3}CH_{2}COOH$
B) $\left( CH_{3} \right)_{2}CH - COOH$
C) $HCOOH$
D) $CH_{3}COOH$
Explanation
(c)
Out of the given acids, strongest is HCOOH.
highest $K_{a}$ value
Since $pK_{a} = - \log K_{a}$
Thus lowest $pK_{a}$ is of HCOOH.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.