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Which of the following will give maximum number of isomers?

1. [Ni(C2O4)(en)]2−
2. [Ni(en)(NH3)4]2+
3. [Cr(SCN)2(NH3)4]+
4. [Co(NH3)4Cl2]

Correct answer: [Ni(C2O4)(en)]2−

Solution

The complex [Ni(C2O4)(en)]2− can exhibit both geometrical and optical isomerism due to the presence of bidentate ligands (C2O4 and en), leading to the maximum number of isomers among the options.

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