Which one of the following complexes are not expected to exhibit isomerism?
[Ni(NH3)4 (H2O)2]2+
[Pt(NH3)2Cl2]
[Ni(NH3)2Cl2]
[Ni(en)3]2+
[Ni(NH3?)2?Cl2?] has tetrahedral geometry and thus, does not exhibit isomerism due to the presence of symmetry elements.
Hence, [Ni(NH3?)2?Cl2?] is not expected to exhibit isomerism.
The correct answer is option 3.