Which of the following does not show optical isomerism - (en =...

Which of the following does not show optical isomerism - (en = Ethylenediamine)

Options

A $\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
B $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
C\left[\mathrm{Co} $\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^{-}$
D\left[\mathrm{Co}(\mathrm{en}) \mathrm{Cl}_2 $\left(\mathrm{NH}_3\right)_2\right]^{+}$

Correct answer

C. \left[\mathrm{Co} $\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^{-}$

Step-by-step solution

As complexes of the type

\left[\mathrm{MA}_3 \mathrm{~B}_3\right]

can show geometrical isomerism knows as facmer isomerism and not optical isomerism. So here \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]^0 can not show optical isomerism.

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