Question

The total number of possible isomers for $[ \text{Pt(NH}_3\text{)}_4\text{Cl}_2 ]\text{Br}_2$ is ___.

Answer 1

The complex$[ \text{Pt(NH}_3\text{)}_4\text{Cl}_2 ]\text{Br}_2$ exhibits three ionization isomers, each of which has two geometrical isomers.

These ionization isomers are:
(i) $[ \text{Pt(NH}_3\text{)}_4\text{Cl}_2 ]\text{Br}_2$
(ii) $[ \text{Pt(NH}_3\text{)}_4\text{ClBr}] \text{BrCl}$
(iii) $[ \text{Pt(NH}_3\text{)}_4\text{Br}_2 ]\text{Cl}$

Ionization isomers refer to compounds with the same molecular formula but different counter ions.
Additionally, each of the mentioned isomers also possesses two geometrical isomers. Geometrical isomers are compounds with different spatial arrangements of atoms but the same molecular formula.