Which of the following does not show optical isomerism? (en= ethylenediamine)

Options

A. `[Co(en)_(3)]^(3+)`
B. `[Co(en)_(2)Cl_(2)]^(+)`
C. `[Co(NH_(3))_(3)Cl_(3)]^(0)`
D. `[Co(en)Cl_(2)(NH_(3))_(2)]^(+)`

Answer

C

Explanation

As complex of the type `[MA_(3)B_(3)]` can show geometrical isomerism knowa as facmer isomerism and not optical isomerism . So here `[Co(NH_(3))_(3)Cl_(3)]^(0)` can not show optical isomerism.