Which of the following does not show optical isomerism ?

Options

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

Answer

B

Explanation

Octahedral complexes of `[M(A A)_(2)B_(2)]` type e.g. `[Co(en)_(2)Cl_(2)]^(+), [M(A A)B_(2)C_(2)] "type e.g, "[Co(en) Cl_(2) (NH_(3))_(2)]^(+) and [M(A A)_(3)] "type e.g, "[Co(en)_(3)]^(3+)`. Show optical isomerism, whereas complexes of `[MA_(3) B_(3)] "type e.g, "[Co(NH_(3))_(3) Cl_(2)]^(-)` do not show optical isomerism.