Which of the following dihalides are `alpha- omega`, gem and vicinal dihalides?
1,2-Dichloropropane

Explanation

To determine the type of dihalide that 1,2-dichloropropane represents, we need to understand the definitions of alpha-omega, geminal, and vicinal dihalides.

### Step-by-Step Solution:

1. **Understanding Dihalides**:
- Dihalides are organic compounds containing two halogen atoms (like Cl, Br, I, etc.) attached to a carbon chain.

2. **Identifying Types of Dihalides**:
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