In which of the following pairs both the complex show optical isomerism? . (a) cis- [Cr(C2O4)2CI2] 3−,cis−[Co(NH3)4CI2] b)[Co(en)3] CI3 , cis−[Co(en)2 CI2] CI (c) [Co(NO3 )3(NH3) 3] ,cis−[Pt(en)2 CI2] (d) [PtCI(en)CI] , [NiCI2Br2]2−

Options

A. `Cis - [Cr(C_2O_4)_2 Cl_2]^(3-) , cis - [Co(NH_3)_4 Cl_2]`
B. `[PtCl (dien)]Cl, [NiCl_2 Br_2]^(2-)`
C. `[Co(NO_3)_3 (NH_3)_3], cis - [Pt(en)_2 Cl_2]`
D. `[Co (en)_3] Cl_3, cis- [Co (en)_2 Cl_2] Cl`

Answer

D

Explanation

`[Co(en)_3]Cl_3` i.e., `[Co(en)_3]^(3+)`

`cis - [Co(en)_2Cl_2]Cl` i.e., `cis [Co(en)_2 Cl_2]^(+)`