Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters?

Explanation

**Step-by-Step Solution:**

1. **Understanding Catalytic Converters:**
- Catalytic converters are devices installed in vehicles to reduce harmful emissions. They convert toxic gases produced during combustion into less harmful substances.

2. **Function of Catalytic Converters:**
- The primary function of catalytic converters is to convert:
- Unburned hydrocarbons into carbon dioxide and water.
...