In coordinate compound [Cr(NH_3)_6] [Co(CN)_6] what type of isomesism…

The correct answer is Option (2) → Coordination Isomerism

To determine the type of isomerism present in the coordinate compound \([Cr(NH_3)_6][Co(CN)_6]\), let us analyze the possible types of isomerism:

1. Ionization Isomerism

This occurs when two or more compounds have the same formula but different ions are present in the solution. Since both the chromium and cobalt complexes are intact and do not produce different ions in solution, this type does not apply here.

2. Coordination Isomerism

Coordination isomerism occurs when there are different arrangements of ligands around the central metal ions, leading to different compounds. In this case, the ligands around chromium and cobalt can vary, producing distinct isomers. For example, if one complex has ammonia coordinated to cobalt and cyanide to chromium, it would lead to different coordination isomers.

3. Linkage Isomerism

Linkage isomerism arises when a ligand can coordinate to a metal in more than one way. For instance, in the case of the cyanide ligand (\(CN^-\)), it can bind through the carbon (cyano) or the nitrogen (isocyano). However, since only one type of cyanide ligand is mentioned in this complex, this does not apply here.

4. Solvate Isomerism

Solvate isomerism occurs when different solvent molecules are associated with the complex. This type is not relevant for the given complex as it does not pertain to the coordination or arrangement of ligands.

Conclusion

The most relevant type of isomerism for the compound \([Cr(NH_3)_6][Co(CN)_6]\) is: Coordination Isomerism.

This is because different arrangements of ligands around the chromium and cobalt can lead to different isomers of the complex