Dihedral angle in staggerred form of ethane is

Options

A. `0^(@)`
B. `120^(@)`
C. `60^(@)`
D. `180^(@)`

Answer

To determine the dihedral angle in the staggered form of ethane, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ethane Structure**: Ethane (C2H6) consists of two carbon atoms, each bonded to three hydrogen atoms. The molecular formula can be represented as CH3-CH3.

2. **Newman Projection**: To visualize the dihedral angle, we can use the Newman projection. In this projection, we look down the bond connecting the two carbon atoms.

3. **Eclipsed vs. Staggered Conformation**: In the eclipsed conformation, the hydrogen atoms on the front carbon are aligned with the hydrogen atoms on the back carbon. In the staggered conformation, the hydrogen atoms are positioned so that they are as far apart as possible.

4. **Rotation to Staggered Conformation**: When the ethane molecule rotates from the eclipsed conformation to the staggered conformation, it rotates 60 degrees.

5. **Defining Dihedral Angle**: The dihedral angle is defined as the angle between the planes formed by the front and back carbon-hydrogen (C-H) bonds.

6. **Calculating the Dihedral Angle**: In the staggered conformation, the dihedral angle between the front C-H bond and the back C-H bond is 60 degrees.

### Final Answer:
The dihedral angle in the staggered form of ethane is **60 degrees**.

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