[NiBr2Cl2]2−→ This complex species is tetrahedral as BrΘ&ClΘ are weak field ligands. [PtBr2Cl2]2−→ As Pt belongs to 5d series. This complex species is square planar. Both the complex species are optically inactive. [NiBr2Cl2]2−, being tetrahedral does not show Geometrical Isomerism. [PtBr2Cl2]2− shows two Geometrical Isomers.