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Which of the following complex is homoleptic? (1) [Co(NH3)4Cl2]^+ (2) [Ni(NH3)2Cl2] (3) [Fe(NH3)4Cl2]^+ (4) [Ni(CN)4]^2-

1. [Co(NH3)4Cl2]^+
2. [Ni(NH3)2Cl2]
3. [Fe(NH3)4Cl2]^+
4. [Ni(CN)4]^2-

Correct answer: [Ni(CN)4]^2-

Solution

A homoleptic complex contains only one type of ligand coordinated to the metal center. In this case, [Ni(CN)4]^2- consists solely of cyanide ligands, making it homoleptic, while the other options contain a mix of different ligands.

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