The O-O-H bond angle in `H_2O_2` (gas phase) is

Options

A. `106^@`
B. `109^@ 28’`
C. `120^@`
D. `94.8^@`

Answer

To determine the O-O-H bond angle in hydrogen peroxide (H₂O₂) in the gas phase, we can follow these steps:

### Step 1: Understand the Structure of H₂O₂
Hydrogen peroxide (H₂O₂) consists of two oxygen atoms and two hydrogen atoms. The molecular structure can be visualized as:
```
H
\
O - O
/
H
```
In this structure, the two oxygen atoms are connected by a single bond, and each oxygen atom is also bonded to a hydrogen atom.

### Step 2: Identify the Bond Angles
In the structure of H₂O₂, we are specifically interested in the O-O-H bond angle. This angle is formed between the two oxygen atoms and the hydrogen atom attached to one of the oxygen atoms.

### Step 3: Determine the O-O-H Bond Angle in Gas Phase
The bond angle can be influenced by various factors such as molecular geometry and steric effects. According to the information provided, the O-O-H bond angle in the gas phase is measured to be 94.8 degrees.

### Step 4: Compare with Solid State
For additional context, it is noted that in the solid state, the O-O-H bond angle is 101.9 degrees. This difference can be attributed to the interactions between molecules in different phases.

### Final Answer
The O-O-H bond angle in H₂O₂ (gas phase) is **94.8 degrees**.

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