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(C) Optical isomerism is shown by complexes that lack a plane of symmetry or center of inversion.$cis-[Co(en)_2Cl_2]^+$ has a $cis$ configuration wher

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$cis-[Co(en)_2Cl_2]^+$

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(C) Optical isomerism is shown by complexes that lack a plane of symmetry or center of inversion.$cis-[Co(en)_2Cl_2]^+$ has a $cis$ configuration where the two $Cl$ ligands are adjacent,which results in the absence of a plane of symmetry,making it chiral.$trans-[Co(en)_2Cl_2]^+$ possesses a plane of symmetry and is therefore achiral.Square planar complexes like $[Pt(NH_3)_2Cl_2]$ are generally achiral because they possess a plane of symmetry (the molecular plane).

Which of the following complexes is capable of showing optical isomerism?

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