Out of following which compound is used for preservation of wood

Options

A. `NaCl`
B. `HgCl_(2)`
C. `ZnCl_(2)`
D. `CaCl_(2)`

Explanation

To determine which compound is used for the preservation of wood, we can analyze the given options: NaCl, HgCl2, ZnCl2, and CaCl2.

### Step-by-Step Solution:

1. **Identify the compounds:**
- NaCl (Sodium Chloride)
- HgCl2 (Mercury(II) Chloride)
- ZnCl2 (Zinc Chloride)
- CaCl2 (Calcium Chloride)

2. **Research the properties and uses of each compound:**
- **NaCl**: Commonly known as table salt, primarily used for seasoning and preserving food, but not specifically for wood preservation.
- **HgCl2**: Mercury(II) chloride is a toxic compound that has been historically used as a disinfectant and preservative, but its use is limited due to toxicity.
- **ZnCl2**: Zinc chloride is known for its ability to act as a wood preservative. It protects wood from decay and insect damage.
- **CaCl2**: Calcium chloride is mainly used for de-icing and as a drying agent, not for wood preservation.

3. **Conclusion:**
- Among the given options, **ZnCl2 (Zinc Chloride)** is the compound that is used for the preservation of wood.

### Final Answer:
**ZnCl2 (Zinc Chloride)** is the compound used for the preservation of wood.

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