The number of axial hydrogen atoms in chair form of cyclohexane is

Options

A. 3
B. 6
C. 12
D. 2

Answer

To determine the number of axial hydrogen atoms in the chair form of cyclohexane, we can follow these steps:

### Step-by-Step Solution:

1. **Draw the Chair Form of Cyclohexane**:
- The chair conformation of cyclohexane resembles a three-dimensional structure that looks like a chair. It has alternating carbon atoms that are staggered to minimize steric strain.

2. **Identify the Carbon Atoms**:
- In the chair form, cyclohexane has six carbon atoms arranged in a way that allows for the attachment of hydrogen atoms.

3. **Locate the Axial and Equatorial Positions**:
- Each carbon atom in the chair form has two positions for substituents: axial (pointing up or down) and equatorial (pointing outward). Axial hydrogens alternate in direction along the ring.

4. **Count the Axial Hydrogen Atoms**:
- For each of the six carbon atoms in the chair form, there is one axial hydrogen. Therefore, we can count the axial hydrogen atoms:
- Carbon 1: 1 axial H
- Carbon 2: 1 axial H
- Carbon 3: 1 axial H
- Carbon 4: 1 axial H
- Carbon 5: 1 axial H
- Carbon 6: 1 axial H
- Total axial hydrogens = 6

5. **Conclusion**:
- The total number of axial hydrogen atoms in the chair form of cyclohexane is **6**.

### Final Answer:
The number of axial hydrogen atoms in the chair form of cyclohexane is **6**.