Which compound has the highest value of pK_a ? - Vidyadip

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
$\begin{array}{*{20}{c}}
{Cl\,\,\,} \\
{|\,\,\,\,\,} \\
{C{H_3} - C - COOH} \\
{|\,\,\,\,\,\,} \\
{Cl\,\,\,\,\,}
\end{array}$

✓

Answer

Correct option: B.

$CH_3 - CH_2 -COOH$

b
$(b)$ Acidic strength $\propto\, - I \, \propto \, \frac{1}{+I}$

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