MCQ
Which of the following compound has least $pK_a$ value
- ✓

- B

- C

- D






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$(a)$ tetraamminecobalt $(III)$ dim-hydroxidotetra amminecobalt $(III)$ ion
$(b)$ di $-\mu -$ hydroxidobis(tetraammine)dicobalt $(III)$
$(c)$ Bis $-(\mu -$ hydroxidotetraamminecobalt $(III))$
$(d)$ di $-\mu-$ hydroxidooctaamminedicobalt $(III)$
correct option is
$\begin{array}{*{20}{c}}
{O\,\,\,\,} \\
{||\,\,\,\,} \\
{C{H_3} - CH - C - C{H_2} - C{H_3}} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}\xrightarrow{{C{F_3}COOOH}}[X]$ as main product
$[X]$ will be :