The complexes `[Co(NH_(3))_(6)][Cr(CN)_(6)]` and `[Cr(NH_(3))_(6)][Co(CN)_(6)]` are the examples of which type of isomerism ?

Options

A. Geometrical isomerism
B. Linkage isomerism
C. ionization isomerism
D. Coordination isomerism

Answer

To determine the type of isomerism exhibited by the complexes \([Co(NH_3)_6][Cr(CN)_6]\) and \([Cr(NH_3)_6][Co(CN)_6]\), we can follow these steps:

### Step 1: Identify the Components of the Complexes
- The first complex is \([Co(NH_3)_6][Cr(CN)_6]\), which consists of a cationic part \([Co(NH_3)_6]^{3+}\) and an anionic part \([Cr(CN)_6]^{3-}\).
- The second complex is \([Cr(NH_3)_6][Co(CN)_6]\), which consists of a cationic part \([Cr(NH_3)_6]^{3+}\) and an anionic part \([Co(CN)_6]^{3-}\).

### Step 2: Analyze the Ligands
- In the first complex, cobalt is coordinated with ammonia (NH₃) ligands, while chromium is coordinated with cyanide (CN⁻) ligands.
- In the second complex, chromium is coordinated with ammonia (NH₃) ligands, while cobalt is coordinated with cyanide (CN⁻) ligands.

### Step 3: Determine the Type of Isomerism
- The key observation is that the ligands are interchanged between the cationic and anionic parts of the complexes.
- This interchange of ligands results in different arrangements of the same ligands around the central metal ions.

### Step 4: Conclusion
- Since the complexes differ in the distribution of ligands around the central metal atoms in the cationic and anionic species, they are classified as **coordination isomers**.

### Final Answer
The complexes \([Co(NH_3)_6][Cr(CN)_6]\) and \([Cr(NH_3)_6][Co(CN)_6]\) are examples of **coordination isomerism**.

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