The chemical formula of Wilkinson's catalyst is :

Explanation

To find the chemical formula of Wilkinson's catalyst, we need to identify the components that make up this catalyst.

### Step-by-Step Solution:

1. **Identify the Metal Center**:
- Wilkinson's catalyst is a coordination compound that contains rhodium (Rh) as the central metal atom.

2. **Identify the Ligands**:
...