cis $-\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-} \rightarrow$ can show optical isomerism (no POS & COS)

$\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+} \rightarrow$ can show (no POS & COS)

$\text { cis }-\left[\mathrm{Pt}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{2+} \rightarrow$ can show (no POS & COS)

$\text { cis }-\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+} \rightarrow$ can show (no POS & COS)

$\operatorname{trans}-\left[\mathrm{Pt}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{2+} \rightarrow$ can't show (contains POS & COS)

$\text { trans }-\left[\mathrm{Cr}(\mathrm{ox})_2 \mathrm{Cl}_2\right]^{3-} \rightarrow$ can't show (contains POS & COS)