Which of the following complexes are homoleptic ?

Options

A. `[Co(NH_(3))_(6)]^(3+)`
B. `[Co(NH_(3))_(4)Cl_(2)]^(+)`
C. `[Ni(CN)_(4)]^(2-)`
D. `[Ni(NH_(3))_(4) Cl_(2)]`

Answer

A, C

Explanation

Homopleptic complex The complex containing only one species or group as ligand is known as homoleptic ligand.
e.g., `[Co(NH_(3))_(6)]^(3+), [Ni(CN)_(4)]^(2-)`
Here, `[Co(NH_(3))_(6)]^(3+)` contain only `NH_(3)` as a ligand and `[Ni(CN)_(4)]^(2-)` contain `CN` as a ligand. While other two complexes `[Co(NH_(3))_(4) Cl_(2)]^(+)` and `[Ni(NH_(3))_(4)Cl_(2)]` contain `NH_(3)` and `Cl` as ligands.
Hence, options (a) and (c) are correct choices.