MCQ
Among the following acids which has the lowest $pKa$ value
- A$C{H_3}COOH$
- ✓$HCOOH$
- C${(C{H_3})_2}CH - COOH$
- D$C{H_3}C{H_2}COOH$
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[${\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{O}} =$ mass $- 18$ isotope of oxygen]