Which one of the following complex ions has geometrical isomers?

Options

A. `[Co(en)_3]^(3+)`
B. `[Ni(NH_3)_5Br^(+)]`
C. `[Co(NH_3)_2(en)_2]^(3+)`
D. `[Cr(NH_3)_4(en)]^(3+)`

Answer

C

Explanation

Geometrical isomerism is shown by disubstituted octahedral complexes su en `[Co(NH_3)_2(en)_2]^(3+)`