Which from following complexes is an example of MA ₂ BC type of distereoisomers?

Step-by-step solution

Complexes of type MA ₂ BC feature a central metal atom (M) with two identical monodentate ligands (A) and two different monodentate ligands (B and C). Option A: [ Co ( en )₂ Cl ₂ ]⁺ uses bidentate ethylenediamine ligands, making it type M ( AA )₂ B ₂ , not MA ₂ BC . Option B: [ Pt ( NH ₃)( H ₂ O ) Cl ₂ ] is square planar. Assigning Cl as A, NH ₃ as B, and H ₂ O as C gives the exact MA ₂ BC formulation. This geometry produces cis-trans diastereoisomers due to the relative positions of B and C when the two A ligands