Which of the following complex compound shows optical isomerism?

Given:- It is given to find the complex compound showing optical isomerism.

Explanation:-

The mixture ${\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{2-}$ shows optical isomerism because its mirror image is not superimposable. It is the complex of the type ${\left[\mathrm{M}(\mathrm{AA}{)}_3\right]}^{n+}$. On the Cr atom, there are three symmetrical bidentate ligands (also known as oxalate ligands). The compound comes in the forms of d and l isomers and is optically active.

Therefore, (C) is the appropriate response. ${\left[\mathrm{Cr}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{2-}$