Question

Which from following complexes is an example of \(\text{MA}_2\text{BC}\) type of distereoisomers?

• A. \([\text{Co(en)}_2\text{Cl}_2]^+\)
• B. \([\text{Pt(NH}_3\text{)(H}_2\text{O)Cl}_2]\)
• C. \(\text{Pt(NH}_3\text{)}_2\text{Cl}_2\)
• D. \([\text{Co(NH}_3\text{)}_4\text{Cl}_2]^+\)

Hint:

MA\(_2\)BC → two identical + two different ligands.

Answer 1

The Correct Option is B

Concept:
\(\text{MA}_2\text{BC}\) type complexes contain:

• Two identical ligands (A)
• Two different ligands (B and C)

Step 1: Analyze each option.

• (A) \([\text{Co(en)}_2\text{Cl}_2]^+\): en is bidentate ligand, not MA\(_2\)BC type $\times$
• (B) \([\text{Pt(NH}_3)(\text{H}_2\text{O})\text{Cl}_2]\): Cl, Cl (same), NH\(_3\), H\(_2\)O (different) \checkmark
• (C) \(\text{Pt(NH}_3)_2\text{Cl}_2\): MA\(_2\)B\(_2\) type $\times$
• (D) \([\text{Co(NH}_3)_4\text{Cl}_2]^+\): MA\(_4\)B\(_2\) type $\times$

Step 2: Conclusion. Only option (B) satisfies MA\(_2\)BC type.