Which of the following complex ions has geometrical isomers?

Options

A. `[Co(en)_(3)]^(3+)`
B. `Ni(NH_(3))_(5)Br]^(+)`
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 such as `[Co(NH_(3))_(2)(en)_(2)]^(3+)`