A) \[{{\operatorname{CH}}_{3}}C{{H}_{2}}COOH\]
B) \[{{\left( C{{H}_{3}} \right)}_{2}}CH-COOH\]
C) HCOOH
D) \[{{\operatorname{CH}}_{3}}COOH\]
Correct Answer: C
Solution :
\[p{{K}_{a}}=-\log \,{{K}_{a}}\]; HCOOH is the strongest acid and hence it has the highest \[{{K}_{a}}\] or lowest \[p{{K}_{a}}\] value.
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