Which of the following isomerism is not possible for complexes having molecular formulae ?<br>(I) Pt — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: Analyze the possible isomerism for each complex formula. Complex I contains the ambidentate ligand SCN^-, which can undergo linkage isomerism. Complex II can exist as [Co(SO4)(NH3)5]Br or [Co(Br)(NH3)5]SO4 (ionisation isomers). Complex III can undergo hydrate isomerism. Step 2: None of the structures formed by these formulas have chiral centers or asymmetric, non-superimposable mirror images. Step 3: Therefore, optical isomerism is completely impossible for all of these formulas, matching option (a).