Chemistry - Coordination Chemistry Question with Solution | TestHub

Complex$\left[\mathrm{C}\mathrm{o}\right(\mathrm{N}{\mathrm{H}}_3{)}_4\mathrm{B}{\mathrm{r}}_2]\mathrm{B}\mathrm{r}$have two G.I. which are optically inactive due to presence of plane of symmetry.
Complex$\left[\mathrm{C}\mathrm{o}\right(\mathrm{N}{\mathrm{H}}_3{)}_3\mathrm{B}{\mathrm{r}}_3]$also have two optically inactive geometrical isomers due to presence of plane of symmetry.
complex$\text{trans-[Co}\left({\text{en)}}_{\text{2}}{\text{Br}}_{\text{2}}\right]\text{Br}$is optically inactive.
Complex$\mathrm{c}\mathrm{i}\mathrm{s}\left[\mathrm{C}\mathrm{o}\right(\mathrm{e}\mathrm{n}{)}_2\mathrm{C}{\mathrm{l}}_2]\mathrm{C}\mathrm{l}$is optically active due to formation of non-superimposable mirror image