Which of the following statements is correct:

Options

A. Ozone is a reasonance hybrid of oxygen.
B. Ozone is an isomer of oxygen.
C. Ozone has no relationship with oxygen.
D. Ozone is an allotropic modification of oxygen.

Explanation

To determine which statement about ozone (O₃) is correct, let's analyze each option provided in the question step by step.

### Step 1: Understanding Ozone and Oxygen
Ozone is a triatomic molecule consisting of three oxygen atoms (O₃), while dioxygen (O₂) is a diatomic molecule consisting of two oxygen atoms. Both are forms of elemental oxygen, but they differ in structure and properties.

### Step 2: Analyzing Each Statement
1. **Ozone is a resonance hybrid of oxygen.**
- This statement is incorrect. Ozone is not a resonance hybrid of dioxygen (O₂). Instead, it has its own distinct molecular structure and is not merely a hybrid of O₂.

2. **Ozone is an isomer of oxygen.**
- This statement is also incorrect. Isomers are compounds that have the same molecular formula but different structures. Ozone (O₃) and dioxygen (O₂) have different molecular formulas and cannot be considered isomers.

3. **Ozone has no relationship with oxygen.**
- This statement is incorrect as well. Ozone is directly related to oxygen; it is formed from dioxygen through photochemical reactions involving UV light. They are interconvertible under certain conditions.

4. **Ozone is an allotropic modification of oxygen.**
- This statement is correct. Ozone is indeed an allotrope of oxygen, as it is a different structural form of the same element.

### Conclusion
The correct statement is: **Ozone is an allotropic modification of oxygen.**

### Final Answer
**D. Ozone is an allotropic modification of oxygen.**

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