In which of the following pairs both the complexes do not show optical isomerism?

Options

A. `cis-[Cr(en)_(2)Cl_(2)]" and "cis-[Co(NH_(3))_(4)Cl_(2)]`
B. `[Co(gly)_(3)]" and "cis-[CoCl_(2)(en)_(2)]`
C. `[Pt(en)Cl_(2)]" and "fac-[Ni(NH_(3))_(3)Cl_(3)]`
D. `mer-[Co(NO_(3))_(3)(NH_(3))_(3)]" and "[PtCl_(2)(en)]`

Answer

A, C

Explanation

`[Co(NH_(3))_(4)Cl_(2)]` does not show O.I.
`[Pt("en")Cl_(2)]` does not show O.I. and G.I.