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

Options

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

Answer

A

Explanation

`|Co(NH_(3))_(3)Cl_(3)|` shows cis or facial (fac) as well trans or meridional (mer). But both these isomers contain plane of symmetry . So they do not exhibit optical isomerism.