Which of the following does not show optical | vedclass

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(A) Optical isomerism is exhibited by only those complexes in which elements of symmetry are absent.Octahedral complexes of the types $[M(aa)_3]$,$[M(

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$[Co(NH_3)_3Cl_3]^0$

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(A) Optical isomerism is exhibited by only those complexes in which elements of symmetry are absent.Octahedral complexes of the types $[M(aa)_3]$,$[M(aa)x_2y_2]$,and $[M(aa)_2x_2]$ lack elements of symmetry and thus exhibit optical isomerism,where $aa$ represents a bidentate ligand,$x$ or $y$ represent monodentate ligands,and $M$ represents the central metal ion.Complexes of the type $[MA_3B_3]$,such as $[Co(NH_3)_3Cl_3]^0$,possess planes of symmetry and therefore do not exhibit optical isomerism.Conversely,$[Co(en)_3]^{3+}$ (type $[M(aa)_3]$),$[Co(en)_2Cl_2]^+$ (type $[M(aa)_2x_2]$),and $[Co(en)Cl_2(NH_3)_2]^+$ (type $[M(aa)x_2y_2]$) all exhibit optical isomerism.

Which of the following does not show optical isomerism?
$(en = \text{ethylenediamine})$

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The number of possible optical isomers for $[Co(en)_2 Cl_2]^+$ is ....

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Which of the following does not show optical isomerism?$(en = \text{ethylenediamine})$