Which of the following is called Wilkinson's catalyst?

Options

A. `[Ph_(3)P)_(3)RhCl]`
B. `TiCl_(4)+(C_(2)H_(5))_(3)Al`
C. `(C_(2)H_(5))_(4)Pb`
D. `[PtCl_(2)(NH_(3))_(2)]`

Explanation

To determine which of the given options is called Wilkinson's catalyst, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Wilkinson's Catalyst**:
- Wilkinson's catalyst is a coordination complex used primarily for the hydrogenation of alkenes (unsaturated hydrocarbons).

2. **Identify the Composition of Wilkinson's Catalyst**:
- The catalyst is specifically a complex of rhodium (Rh) and is represented by the formula: \[ \text{RhCl(PPh}_3\text{)}_3 \]
- Here, "PPh₃" stands for triphenylphosphine, which is a ligand.

3. **Recognize the Characteristics of Wilkinson's Catalyst**:
- It is a red-brown solid and is soluble in hydrocarbon solvents like benzene.

4. **Analyze the Given Options**:
- Compare the options provided in the question with the known formula of Wilkinson's catalyst.

5. **Identify the Correct Option**:
- Look for the option that matches the formula \[ \text{RhCl(PPh}_3\text{)}_3 \].

6. **Confirm the Correct Answer**:
- The option that matches this formula is the correct answer, which is often referred to as Chloridotris(triphenylphosphine)rhodium(I).

### Conclusion:
The correct answer to the question "Which of the following is called Wilkinson's catalyst?" is the option that corresponds to the formula \[ \text{RhCl(PPh}_3\text{)}_3 \].

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