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In which of the following pairs both the complexes show optical isomerism?

ChemistryCoordination CompoundsAIIMSAIIMS 2005

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A cis- $\left[\mathrm{Cr}\left(\mathrm{C}_2 \mathrm{O}_4\right)_2 \mathrm{Cl}_2\right]^{3-}$, cis- $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]$
B $\left[\mathrm{Co}(e n)_3\right] \mathrm{Cl}_3$, cis $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right] \mathrm{Cl}$
C $[\mathrm{PtCl}$ (dien $)] \mathrm{Cl},\left[\mathrm{NiCl}_2 \mathrm{Br}_2\right]^{2-}$
D $\left[\mathrm{Co}\left(\mathrm{NO}_3\right)_3\left(\mathrm{NH}_3\right)_3\right]$, cis-[Pt(en $\left.)_2 \mathrm{Cl}_2\right]$