Which kind of isomerism is exhibited by octahedral [Co(NH3)4Br2]Cl ? — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: Geometrical isomerism is exhibited by [MA4B2] octahedral complexes (such as [Co(NH3)4Br2]^+) which can form cis and trans isomers based on the relative spatial positions of the two bromide ligands. Step 2: Ionization isomerism occurs when the outer-sphere counterion Cl^- is exchanged with an inner-sphere Br^- ligand to produce the isomer [Co(NH3)4(Br)(Cl)]Br. Step 3: Thus, the complex exhibits both geometrical and ionization isomerism, matching option (a).