Bond angle in chair form of cyclohexane is

Options

A. `109^(@)28'`
B. `120^(@)`
C. `60^(@)`
D. `108^(@)`

Answer

To determine the bond angle in the chair form of cyclohexane, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Cyclohexane**:
- Cyclohexane (C6H12) is a cyclic alkane that can adopt various conformations. The most stable conformation is the chair form.

2. **Identify the Chair Conformation**:
- In the chair conformation, the carbon atoms are arranged in a way that minimizes steric strain and allows for optimal bond angles.

3. **Determine the Bond Angles**:
- In the chair form of cyclohexane, the bond angles between adjacent carbon atoms are approximately 109.5 degrees. This is close to the tetrahedral angle, which is 109.5 degrees.

4. **Convert Degrees to Degrees and Minutes**:
- The bond angle can also be expressed in degrees and minutes. The bond angle of 109.5 degrees can be converted to 109 degrees and 30 minutes. However, the commonly accepted value for the chair conformation is often rounded to 109 degrees and 28 minutes.

5. **Select the Correct Option**:
- Given the options:
- 109 degrees 28 minutes
- 120 degrees
- 60 degrees
- 108 degrees
- The correct bond angle in the chair form of cyclohexane is 109 degrees 28 minutes, which corresponds to option one.

### Final Answer:
The bond angle in the chair form of cyclohexane is **109 degrees 28 minutes**.

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