Which of the following is an example of vic-dihalide?

Options

A. Dichloromethane
B. 1,2-Dichloroethane
C. Ethylidene chloride
D. Allyl chloride

Explanation

To determine which of the given compounds is an example of a vicinal dihalide, we need to understand the definition and structure of vicinal dihalides.

### Step-by-Step Solution:

1. **Definition of Vicinal Dihalide**:
- Vicinal dihalides, also known as 1,2-dihalides, are compounds that have two halogen atoms (like chlorine or bromine) attached to adjacent carbon atoms in a carbon chain.

2. **Analyzing the Given Compounds**:
- **Trichloromethane (CHCl₃)**: This compound has one carbon atom with three chlorine atoms attached. It does not fit the definition of a vicinal dihalide because it does not have two halogens on adjacent carbons.
- **1,2-Dichloroethane (C₂H₄Cl₂)**: This compound has two carbon atoms, and both chlorine atoms are attached to these adjacent carbon atoms (C1 and C2). This fits the definition of a vicinal dihalide.
- **Ethylidene Chloride (C₂H₃Cl)**: This compound has two carbon atoms, but only one chlorine atom is attached to one of the carbons. Therefore, it does not qualify as a vicinal dihalide.
- **Allyl Chloride (C₃H₅Cl)**: This compound has a double bond and one chlorine atom attached to one of the carbon atoms. It does not have two halogens on adjacent carbons, so it is not a vicinal dihalide.

3. **Conclusion**:
- Among the given options, **1,2-Dichloroethane** is the only compound that qualifies as a vicinal dihalide because it has two chlorine atoms on adjacent carbon atoms.

### Final Answer:
**1,2-Dichloroethane** is an example of a vicinal dihalide.

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