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Which one of the following complexes is not expected to exhibit isomerism?

1. [Ni(en)3]2+
2. [Ni(NH3)4(H2O)2]2+
3. [Pt(NH3)2Cl2]
4. [Ni(NH3)2Cl2]

Correct answer: [Ni(en)3]2+

Solution

The complex [Ni(en)3]2+ does not exhibit isomerism because it contains a single type of bidentate ligand (en), and the geometry is fixed as octahedral without any possibility of geometric or optical isomerism.

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