If the orders of reduction potential is then :

Options

A. Y will oxidize X only
B. Y will oxidize Z only
C. Z will oxidize both X and Y
D. Z will reduce both X and Y

Explanation

To solve the problem, we need to analyze the given information about the reduction potentials of the substances involved and determine the correct statement based on that.

### Step-by-Step Solution:

1. **Identify the Reduction Potentials**:
We are given the order of reduction potentials as Z > Y > X. This means:
- Z has the highest reduction potential (strongest oxidizing agent).
- Y has a moderate reduction potential.
- X has the lowest reduction potential (strongest reducing agent).

2. **Understanding Oxidizing and Reducing Agents**:
- A substance with a high reduction potential is a strong oxidizing agent because it can easily gain electrons and get reduced.
- Conversely, a substance with a low reduction potential is a strong reducing agent because it can easily lose electrons and get oxidized.

3. **Analyzing the Statements**:
We have four statements to evaluate:
- **Statement A**: Y will oxidize X and not Z.
- **Statement B**: Y will oxidize Z and not X.
- **Statement C**: Y will oxidize both X and Z.
- **Statement D**: Y will reduce both X and Z.

4. **Evaluating Each Statement**:
- **Statement A**: True. Since Y has a higher reduction potential than X, it can oxidize X. However, since Z has a higher reduction potential than Y, Y cannot oxidize Z.
- **Statement B**: False. Y cannot oxidize Z because Z is a stronger oxidizing agent than Y.
- **Statement C**: False. Y cannot oxidize both X and Z, as it cannot oxidize Z.
- **Statement D**: False. Y cannot reduce both X and Z, as it is not a strong enough reducing agent compared to Z.

5. **Conclusion**:
The only correct statement is **Statement A**: Y will oxidize X and not Z.

### Final Answer:
The correct statement is **A**: Y will oxidize X and not Z.