The incorrect statement about the structure of `H_2O_2` is

Options

A. It is non-linear and non-planar molecule
B. It has an open book type structure
C. Dihedral angle in both gas phase and solid phase is 111.5deg
D. Dihedral angle in gas phase is 111.5deg and in solid phase is 90.2deg

Answer

To determine the incorrect statement about the structure of H₂O₂ (hydrogen peroxide), we need to analyze the key features of its molecular geometry and the angles associated with it.

### Step-by-Step Solution:

1. **Understanding the Structure of H₂O₂**:
- H₂O₂ has a non-linear and non-planar structure. It is often described as having an "open book" conformation.

2. **Identifying the Bond Angles**:
- The dihedral angle in the gas phase is approximately 105.5 degrees.
- In the solid phase, the dihedral angle is around 90.2 degrees.

3. **Comparing the Angles**:
- It is important to note that the angles in the gas phase and solid phase are different. This means that any statement claiming the angles are the same in both phases is incorrect.

4. **Reviewing the Options**:
- If given options include statements about the angles being the same in both phases, that would be the incorrect statement.

5. **Conclusion**:
- The incorrect statement about the structure of H₂O₂ is that the dihedral angle is the same in both gas and solid phases.