MCQ
Which compound has the highest value of $pK_a$ ?
- A$Cl - CH_2 - CH_2 - COOH$
- ✓$CH_3 - CH_2 -COOH$
- C$\begin{array}{*{20}{c}}
{C{H_3} - CH - COOH} \\
{|\,\,\,\,\,\,\,\,\,\,\,} \\
{Cl\,\,\,\,\,\,\,\,\,}
\end{array}$ - D$\begin{array}{*{20}{c}}
{Cl\,\,\,} \\
{|\,\,\,\,\,} \\
{C{H_3} - C - COOH} \\
{|\,\,\,\,\,\,} \\
{Cl\,\,\,\,\,}
\end{array}$
