Coordination Compounds

Coordination Compounds

Question

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

  • [Co(en)3]3+

  • [Co(en)2Cl2]+

  • [Co(NH3)3Cl3]

  • [Co(NH3)3Cl3]

Answer

C.

[Co(NH3)3Cl3]

Complexes of the type [MA2(AA2), [M(AA3)] exhibit optical isomerism.
Optical Isomerism is shown by only those complexes which lack elements of symmetry.
In the given complexes, [Co(NH3)3Cl3] shows facial as well as meridional isomerism. But both of the forms contain a plane of symmetry. Thus, only [Co(NH3)3Cl3] complex does not show optical isomerism.

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