How does the chain termination occurs in the halogenation reaction of alkanes?

Explanation

To understand how chain termination occurs in the halogenation reaction of alkanes, we can break down the process into three main steps: initiation, propagation, and termination. Let's focus on the termination step, which is the main focus of the question.

### Step-by-Step Solution:

1. **Initiation Step**:
- The halogenation reaction begins with the initiation step, where a halogen molecule (like Br2) is dissociated into two free radicals. This usually occurs in the presence of heat or light.
- For example, when bromine (Br2) is exposed to light, it breaks apart to form two bromine radicals (Br•):
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