Which of the following complexes are heteroleptic ?

Options

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

Answer

B, D

Explanation

Heteropleptic complexes Coordination complexes which contain more than one type of ligands are known as heteropletic complexes.
e.g., `[Fe(NH_(3))_(4)Cl_(2)]^(+)` contain `NH_(3)` and `Cl` as a ligand is as heteroleptic complex. Similarly `[Co(NH_(3))_(4)Cl_(2)]` contain `NH_(3)` and `Cl` as ligand is also a heteroleptic complex.
Hence, options (b) and (d) are correct choices.