Question

Which one of the following pairs of isomers and types of isomerism are correctly matched?
(i) $\left[Co\right(N{H}_3{)}_5\left(N{O}_2\right)]C{l}_2$ and $\left[Co\right(N{H}_3{)}_5\left(ONO\right)C{l}_2...\left(Linkage\right)$
(ii) $\left[Cu\right(N{H}_3{)}_4\left]\right[PtC{l}_4]$ and $\left[Pt\right(N{H}_3{)}_4\left]\right[CuC{l}_4]...(Coordination)$
(iii) $\left[PtC{l}_2\right(N{H}_3{)}_4]B{r}_2$ and $\left[PtB{r}_2\right(N{H}_3{)}_4]C{l}_2...(Ionization)$
Select the correct answer using the codes given below:

• A. (ii) and (iii)
• B. (i), (ii) and (iii)
• C. (i) and (iii)
• D. (i) and (ii)

Answer 1

The correct option is B (i), (ii) and (iii)

(i) The complexes $\left[Co\right(N{H}_3{)}_5\left(N{O}_2\right)]C{l}_2$ and $\left[Co\right(N{H}_3{)}_5\left(ONO\right)]C{l}_2$ exhibit linkage isomerism.
This is because the nitro group is ambidentate ligand and has two donor atoms N and O.

(ii) The complexes $\left[Cu\right(N{H}_3{)}_4\left]\right[PtC{l}_4]$ and $\left[Pt\right(N{H}_3{)}_4\left]\right[CuC{l}_4]$ exhibit coordination isomerism in which the ligands in the complex cation and the complex anion are interchanged.

(iii) The complexes $\left[PtC{l}_2\right(N{H}_3{)}_4]B{r}_2$ and $\left[PtB{r}_2\right(N{H}_3{)}_4]C{l}_2$ are examples of ionization isomers as there is exchange of ions inside and outside the coordination sphere.