Chemistry - Coordination Chemistry Question with Solution | TestHub

The question asks to identify the option where complexes in Set-I show geometrical isomerism and complexes in Set-II are ionization isomers.

Set-I:

1. For $\left[\mathrm{Co}({\mathrm{NH}}_3{)}_3({\mathrm{NO}}_2{)}_3\right]$: This is an ${\mathrm{MA}}_3{\mathrm{B}}_3$ type complex, which exhibits facial (fac) and meridional (mer) geometrical isomers.

2. For $\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]$: This is an ${\mathrm{M}(\mathrm{AA})}_2{\mathrm{B}}_2$ type complex, which exhibits cis and trans geometrical isomers.

Set-II:

$\left[\mathrm{Co}({\mathrm{NH}}_3{)}_5\mathrm{Cl}\right]{\mathrm{SO}}_4$ and $\left[\mathrm{Co}({\mathrm{NH}}_3{)}_5{\mathrm{SO}}_4\right]\mathrm{Cl}$ are ionization isomers because they differ in the counter ion and a ligand directly bonded to the central metal ion, resulting in different ions when dissolved in solution.

Therefore, option C satisfies both conditions.