Classify the following compounds as primary, secondary and tertiary halides.

Explanation

To classify the given compounds as primary, secondary, or tertiary halides, we need to analyze the structure of each compound and determine the number of carbon atoms attached to the carbon that is bonded to the halogen (in this case, bromine).

### Step-by-Step Solution:

1. **Identify the first compound: 1-bromo-but-2-ene**
- **Structure**: The compound has a total of four carbon atoms (but-2-ene).
- **Drawing the structure**:
- The structure can be represented as:
...