Explain which of the following coordination compounds have geometric isomers? If the geometry of the coordination compound is given. There may be more than one correct choice thus select all that apply.
1. SquarePlanar: Pt(NH3)2Cl2
2. Square Planar:Cu(NH3)3Cl
3. Octahedral:Ni(NH3)3Cl3-
4. Octahedral:Co(NH3)5Cl2+