Question

In coordination compounds, the hydrate isomers differ in ?

• A. Coordination number of the metal atom
• B. Number of water molecules as hydration
• C. Both (A) and (B)
• D. Number of water molecules present as ligands

Answer 1

The correct option is C Both (A) and (B)

When water molecules are exchanged between coordination sphere and ionisation sphere, the resulting isomers are called hydrate isomers. This phenomenonon is hydrate isomerism.
Hence, the number of water molecule present in coordination sphere and ionisation sphere differs for hydrate isomers.

Example:
$\left[Co\right(en{)}_2\left(H_{2}O\right)Cl]C{l}_2$ and $\left[Co\right(en{)}_{2}C{l}_2]Cl.H_{2}O$

Hence, option (c) is correct.