Which of the following complex species is not expected to exhibit optical isomerism ?

Options

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

Answer

C

Explanation

Optical isomerism is exhibited by only those complexes which lacks elements of symmetry
`[Co(NH_(3))_(3)CL_(3)]` shows facial as well as meridional isomerism But both the forms contain plane of symmetry thus , this complex does not exhibit optical isomerism