Which of the following oxy acids does not contain peroxy bond

Options

A. POernitric acid
B. Caro's acid
C. Perchloride acid
D. Marshall's acid

Explanation

To determine which of the following oxy acids does not contain a peroxy bond, we need to analyze the structures of the given acids. A peroxy bond is characterized by an O-O bond.

### Step-by-Step Solution:

1. **Identify the Oxy Acids**: We need to analyze the following oxy acids:
- Per-nitric acid (HNO4)
- Peroxymonosulfuric acid (H2SO5)
- Perchloric acid (HClO4)
- Marshall's acid (H2S2O8)

2. **Analyze Per-nitric Acid (HNO4)**:
- Structure: HNO4 has a structure that includes an O-O bond (N-O-O).
- Conclusion: Contains a peroxy bond.

3. **Analyze Peroxymonosulfuric Acid (H2SO5)**:
- Structure: H2SO5 has a structure that includes an O-O bond (HOSO2-O-OH).
- Conclusion: Contains a peroxy bond.

4. **Analyze Perchloric Acid (HClO4)**:
- Structure: HClO4 has a structure with no O-O bond (Cl=O, Cl=O, Cl=O, and Cl-OH).
- Conclusion: Does not contain a peroxy bond.

5. **Analyze Marshall's Acid (H2S2O8)**:
- Structure: H2S2O8 has a structure that includes an O-O bond (HOSO2-O-O-SO2OH).
- Conclusion: Contains a peroxy bond.

6. **Final Conclusion**: Among the acids analyzed, **Perchloric Acid (HClO4)** does not contain a peroxy bond.

### Answer:
The oxy acid that does not contain a peroxy bond is **Perchloric Acid (HClO4)**.

---