The dihedral angle of `H_(2)O_(2)` in solid phase is

Options

A. `111.5^(@)`
B. `90.2^(@)`
C. `94.8^(@)`
D. `101.9^(@)`

Answer

To determine the dihedral angle of hydrogen peroxide (H₂O₂) in its solid phase, we can follow these steps:

### Step 1: Understand the Structure of H₂O₂
Hydrogen peroxide has a unique structure where two oxygen atoms are bonded to each other, and each oxygen is also bonded to a hydrogen atom. This results in an open book-like structure.

### Step 2: Visualize the Molecule
Draw the H₂O₂ molecule to visualize its structure. The two oxygen atoms (O) are in the center, and the hydrogen atoms (H) are bonded to each oxygen. The arrangement resembles an open book.

### Step 3: Identify the Dihedral Angle
The dihedral angle is defined as the angle between two planes. In the case of H₂O₂, we need to find the angle between the planes formed by the atoms in the molecule.

### Step 4: Reference Known Values
From literature and chemical data, it is known that the dihedral angle of H₂O₂ in its solid phase is approximately 90.2°.

### Step 5: Evaluate the Options
Given the options:
- 111.5°
- 90.2°
- 94.8°
- 101.9°

Based on our understanding and the known value, we can conclude that the correct answer is 90.2°.

### Final Answer
The dihedral angle of H₂O₂ in the solid phase is **90.2°**.

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