Which of the following reactions does not take place?

Options

A. `F_(2)+2Cl^(-)rarr 2F^(-)+Cl_(2)`
B. `Br_(2)+2l^(-)rarr2Br^(-)+I_(2)`
C. `Cl_(2)+2Br^(-)rarr2Cl^(-)+Br_(2)`
D. `Cl_(2)+2F^(-)rarr2Cl^(-)+F_(2)`

Answer

To determine which of the following reactions does not take place, we need to analyze the oxidation and reduction processes involved in the reactions based on the electrochemical series.

### Step-by-Step Solution:

1. **Understanding Oxidation and Reduction**:
- In any redox reaction, oxidation (loss of electrons) and reduction (gain of electrons) occur simultaneously. The species that gains electrons is reduced, while the species that loses electrons is oxidized.

2. **Identifying the Strongest Oxidizing and Reducing Agents**:
- According to the electrochemical series, the strength of oxidizing and reducing agents can be determined. The order of strength is as follows:
- F2 (Fluorine) > Cl2 (Chlorine) > Br2 (Bromine) > I2 (Iodine)
- Fluorine is the strongest oxidizing agent, while Iodine is the weakest.

3. **Analyzing the Given Reactions**:
- We need to evaluate the reactions involving F2, Cl2, Br2, and I2 to see which can oxidize or reduce the others.
- For example:
- F2 can oxidize Cl-, Br-, and I-.
- Cl2 can oxidize Br- and I-.
- Br2 can oxidize I-.
- I- cannot oxidize any of the other halogens.

4. **Identifying the Impossible Reaction**:
- Since F2 is the strongest oxidizing agent, it cannot be oxidized by any other species. Therefore, any reaction where F2 is being oxidized (losing electrons) by another species is not possible.
- For instance, if we have a reaction where Cl2 is trying to oxidize F2, this is impossible because F2 is already in its highest oxidation state and cannot be oxidized further.

5. **Conclusion**:
- The reaction that does not take place is where a stronger oxidizing agent (F2) is being oxidized by a weaker one (Cl2). Thus, the answer is that the reaction involving Cl2 oxidizing F2 does not occur.

### Final Answer:
The reaction that does not take place is when Cl2 tries to oxidize F2.