Identify the type of structural isomerism that exists in each of the following pairs of compounds.

Question

(a) [CoCl2(NH3)4]Cl·H2O and [CoCl(NH3)4(H2O)]Cl2
coordination isomerism
geometrical isomerism
hydrate isomerism
ionization isomerism
linkage isomerism
optical isomerism

(b) [Pt(NH3)4][PtCl6] and [PtCl2(NH3)4][PtCl4]
coordination isomerism
geometrical isomerism
hydrate isomerism
ionization isomerism
linkage isomerism
optical isomerism

Answer 1

I didn't draw (a) out but isn't that just hydrate isomerism; i.e., H2O is outside the coordination sphere in the first and inside in the second. It has switched with one Cl. AgNO3 would ppt 1 mol AgCl per mol complex for #1 but 2 mol AgCl per mol complex for #2.