Question:
The complexes $[Co(NH_3)_6] [Cr(CN)_6]$ and $[Cr(NH_3)_6 ][Co(CN)_6]$ are examples of
The complexes $[Co(NH_3)_6] [Cr(CN)_6]$ and $[Cr(NH_3)_6 ][Co(CN)_6]$ are examples of
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Look for two sets of square brackets. If the metals have swapped their partner ligands across those brackets, it is always coordination isomerism.
Updated On: Jun 26, 2026
- linkage isomerism
- ionisation isomerism
- solvate isomerism
- coordination isomerism
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Coordination isomerism occurs in salts where both the cation and the anion are complex ions, and there is an exchange of ligands between the two metal centers.
Step 2: Detailed Explanation:
1. In the first complex $[Co(NH_3)_6][Cr(CN)_6]$, $NH_3$ is bonded to $Co$ and $CN^-$ is bonded to $Cr$.
2. In the second complex $[Cr(NH_3)_6][Co(CN)_6]$, the ligands have swapped centers: $NH_3$ is now bonded to $Cr$ and $CN^-$ is bonded to $Co$.
3. This swap of ligands between two metal coordination spheres is the definition of coordination isomerism.
Step 3: Final Answer:
These are examples of coordination isomerism.
Coordination isomerism occurs in salts where both the cation and the anion are complex ions, and there is an exchange of ligands between the two metal centers.
Step 2: Detailed Explanation:
1. In the first complex $[Co(NH_3)_6][Cr(CN)_6]$, $NH_3$ is bonded to $Co$ and $CN^-$ is bonded to $Cr$.
2. In the second complex $[Cr(NH_3)_6][Co(CN)_6]$, the ligands have swapped centers: $NH_3$ is now bonded to $Cr$ and $CN^-$ is bonded to $Co$.
3. This swap of ligands between two metal coordination spheres is the definition of coordination isomerism.
Step 3: Final Answer:
These are examples of coordination isomerism.
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