Question

Which of the following pairs of isomers and types of isomerism are correctly matched?
(1) $\left[Co{\left(N{H}_3\right)}_5\left(N{O}_2\right)\right]C{l}_2$ and $\left[Co{\left(N{H}_3\right)}_5(ONO)\right]C{l}_2$ Linkage isomers
(2) $\left[Cu{\left(N{H}_3\right)}_4\right]\left[PtC{l}_4\right]$ and $\left[Pt{\left(N{H}_3\right)}_4\right]\left[CuC{l}_4\right]$ Co-ordinationIsomers
(3) $\left[Pt{\left(N{H}_3\right)}_{4}C{l}_2\right]B{r}_2$ and $\left[Pt{\left(N{H}_3\right)}_{4}B{r}_2\right]C{l}_2$ Ionisation Isomers
Select the correct answer using the codes given below:

• A. 1 and 2
• B. 2 and 3
• C. 1 and 3
• D. 1, 2 and 3

Answer 1

Answer: (D)

(i) The complexes $\left[Co{\left(N{H}_3\right)}_5\left(N{O}_2\right)\right]C{l}_2$ and $\left[Co{\left(N{H}_3\right)}_5(ONO)\right]C{l}_2$ exhibit linkage isomerism. This is because the nitro group is ambidentate ligand and has two donor atoms $N$ and $O$.
(ii) The complexes $\left[Cu{\left(N{H}_3\right)}_4\right]\left[PtC{l}_4\right]$ and $\left[Pt{\left(N{H}_3\right)}_4\right]\left[CuC{l}_4\right]$ exhibit coordination isomerism in which the ligands in the complex cation and the complex anion are interchanged.
(iii) The complexes $\left[PtC{l}_2{\left(N{H}_3\right)}_4\right]B{r}_2$ and $\left[PtB{r}_2{\left(N{H}_3\right)}_4\right]C{l}_2$ are examples of ionization isomers as there is exchange of ions inside and outside the coordination sphere.