Question

Which of the following compounds would exhibit co-ordination isomerism?

• A. $\left[Cr\right(H_{2}O{)}_5]C{l}_2$
• B. $\left[Cr\right(N{H}_3{)}_5\left]\right[Co\left(CN{)}_5\right]$
• C. $\left[Cr\right(en{)}_2]N{O}_2$
• D. $\left[Ni\right(N{H}_3{)}_5\left]\right[B{F}_4{]}_3$

Answer 1

The correct option is B $\left[Cr\right(N{H}_3{)}_5\left]\right[Co\left(CN{)}_5\right]$

Co-ordination isomerism is a form of structural isomerism in which the composition of the complexion varies. In a coordination isomer, the total ratio ligand to metal remains the same, but the ligand attached to specific metal ion change. In B option ratio of metal to the ligand is the same and they can exchange their ligands ($N{H}_3,CN)$.