In which of the following pairs both the complexes show optical isomerism ?
A
cis−[Cr(C2O4)2Cl2]3−,cis−[Co(NH3)4Cl2]
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B
[Co(en)3]Cl3,cis−[Co(en)2Cl2]Cl
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C
[PtCl(dien)]Cl,[NiCl2Br2]2−
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D
[Co(NO3)3],cis−[Pt(en)2Cl2]
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Solution
The correct option is C[Co(en)3]Cl3,cis−[Co(en)2Cl2]Cl For the complex to be optically active, it should be chiral i.e all the four valencies should have different groups or there should be absence of centre of symmetry, plane of symmetry and axis of symmetry.
In option b, the complexes have bidentate ligands in which none of the elements of symmetry is present. Therefore, they can show optical isomerism.