The species that does not contain peroxide bond is //are :

Options

A. `PbO_(2)`
B. `H_(2)O_(2)`
C. `SrO_(2)`
D. `BaO_(2)`

Explanation

To solve the question of which species does not contain a peroxide bond, we will analyze each of the given compounds one by one. A peroxide bond is characterized by the presence of an O-O bond where the oxidation state of each oxygen is -1.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds given are PbO2, H2O2, SrO2, and BaO2.

2. **Analyze PbO2**:
- Structure: PbO2 consists of lead (Pb) bonded to two oxygen atoms.
- Oxidation State: In PbO2, the oxidation state of oxygen is -2 (since lead is in the +4 oxidation state).
- Conclusion: PbO2 does not contain a peroxide bond.

3. **Analyze H2O2**:
- Structure: H2O2 is known as hydrogen peroxide.
- Oxidation State: In H2O2, each oxygen has an oxidation state of -1.
- Conclusion: H2O2 contains a peroxide bond.

4. **Analyze SrO2**:
- Structure: SrO2 consists of strontium (Sr) bonded to two oxygen atoms.
- Oxidation State: In SrO2, the oxidation state of each oxygen is -1 (since strontium is in the +2 oxidation state).
- Conclusion: SrO2 contains a peroxide bond.

5. **Analyze BaO2**:
- Structure: BaO2 consists of barium (Ba) bonded to two oxygen atoms.
- Oxidation State: In BaO2, the oxidation state of each oxygen is -1 (since barium is in the +2 oxidation state).
- Conclusion: BaO2 contains a peroxide bond.

6. **Final Answer**: The species that does not contain a peroxide bond is **PbO2**.