Which of the following complex`(s)`is//are an example of homolepic complex .

Options

A. `a)[Co(NH_(3))_(6)]^(3+)`
B. `b)[Cr(H_(2)O)_(6)]^(3+)`
C. `c)[Ni(NH_(3))_(6)]^(2+)`
D. `d)[Ni(NH_(3))_(4)CI_(2)]`

Answer

To determine which of the given complexes are examples of homoleptic complexes, we need to follow these steps:

### Step 1: Understand the Definition of Homoleptic Complexes
A homoleptic complex is defined as a coordination compound where all the ligands attached to the central metal atom are identical. This means that if a complex has more than one type of ligand, it cannot be classified as homoleptic.

### Step 2: Analyze Each Complex
Let’s analyze the given complexes one by one to identify if they are homoleptic or not.

1. **Complex A**: If this complex has six amine ligands bound to a cobalt central atom, then it is homoleptic because all ligands (amines) are identical.

2. **Complex B**: If this complex has a chromium central atom with six aqua ligands, it is also homoleptic as all ligands (aqua) are identical.

3. **Complex C**: If this complex has a nickel central atom with six amine ligands, it is again homoleptic since all ligands (amines) are identical.

4. **Complex D**: If this complex contains two types of ligands (e.g., amine and chloride), it cannot be homoleptic because it does not consist of identical ligands.

### Step 3: Conclusion
Based on the analysis:
- Complex A, Complex B, and Complex C are homoleptic complexes.
- Complex D is not a homoleptic complex as it contains two different types of ligands.

### Final Answer
The complexes that are examples of homoleptic complexes are **A, B, and C**.

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