Chemistry - Coordination Chemistry Question with Solution | TestHub

The given complexes in option B, $[Co(py{)}_2(H_{2}O)C{l}_2]Cl$ and $[Co(py{)}_2(H_{2}O{)}_{2}Cl]Cl$, are not ionization isomers. Ionization isomers differ in the counter ion and a ligand directly bonded to the metal. Here, the counter ion is Cl⁻ in both, and the ligands within the coordination sphere are different, but they don't exchange with the counter ion. They are actually hydration isomers.