In the extraction of chlorine from brine_________

Options

A. reduction
B. displacement
C. oxidation
D. evaporation

Explanation

To solve the question regarding the extraction of chlorine from brine, we will analyze the chemical reaction involved and determine the type of reaction it represents.

### Step-by-Step Solution:

1. **Identify the Composition of Brine**:
- Brine is a concentrated solution of sodium chloride (NaCl) in water (H2O).

2. **Write the Ionic Equation**:
- The electrolysis of brine can be represented by the following ionic equation:
\[ 2 \text{Cl}^- + 2 \text{H}_2\text{O} \rightarrow \text{Cl}_2 + 2 \text{OH}^- + \text{H}_2 \]
- This equation shows that chloride ions (Cl^-) from the brine react with water.

3. **Analyze the Oxidation States**:
- In the reactants, the oxidation state of chlorine (Cl) in Cl^- is -1.
- In the products, the oxidation state of chlorine in Cl2 is 0.
- This indicates that the oxidation state of chlorine is increasing from -1 to 0.

4. **Determine the Type of Reaction**:
- Since the oxidation state of chlorine is increasing, this process is classified as oxidation.
- In general, oxidation is defined as the loss of electrons or an increase in oxidation state.

5. **Conclusion**:
- Therefore, the extraction of chlorine from brine is an oxidation reaction.

### Final Answer:
The correct option is **oxidation**.

---