QuestionCoordination / geometrical isomerism
Which one of the following complexes will NOT show geometrical isomerism?
- (a) [Cr(NH₃)₄Cl₂]Cl
- (b) [Co(en)₂Cl₂]Cl
- (c) [Co(NH₃)₅NO₂]Cl₂
- (d) Pt(NH₃)₂Cl₂
Answer: (c) [Co(NH₃)₅NO₂]Cl₂
MA₄B₂ ([Cr(NH₃)₄Cl₂]⁺), M(AA)₂B₂ ([Co(en)₂Cl₂]⁺) and square planar MA₂B₂ (Pt(NH₃)₂Cl₂) all show cis/trans. [Co(NH₃)₅NO₂]²⁺ is MA₅B: only one arrangement → no geometrical isomers → (c). (It shows linkage isomerism.)