Question:
Identify pair of complexes that exhibits solvate isomerism?
Identify pair of complexes that exhibits solvate isomerism?
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Look for the movement of $H_2O$ molecules across the square brackets $[ \ ]$.
Updated On: May 14, 2026
- $[\text{Cr}(\text{H}_2\text{O})_6]\text{Cl}_3$ and $[\text{Cr}(\text{H}_2\text{O})_5\text{Cl}]\text{Cl}_2 \cdot \text{H}_2\text{O}$
- $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}$ and $[\text{Co}(\text{NH}_3)_5\text{Br}]\text{SO}_4$
- $[\text{Co}(\text{NH}_3)_6][\text{Cr}(\text{CN})_6]$ and $[\text{Cr}(\text{NH}_3)_6][\text{Co}(\text{CN})_6]$
- $[\text{Fe}(\text{H}_2\text{O})_5\text{SCN}]^+$ and $[\text{Fe}(\text{H}_2\text{O})_5\text{NCS}]^+$
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The Correct Option is A
Solution and Explanation
Step 1: Concept Solvate isomerism (or hydrate isomerism) occurs when water molecules are exchanged between the coordination sphere and the crystal lattice.
Step 2: Meaning These isomers have the same chemical formula but differ in the number of solvent molecules directly bonded to the metal ion.
Step 3: Analysis In pair (A), one isomer has 6 $H_2O$ in the sphere, while the other has 5 $H_2O$ in the sphere and 1 as water of crystallization.
Step 4: Conclusion Pair (A) represents the classic example of hydrate/solvate isomerism. Final Answer: (A)
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