The dihedral angle of the most stable anti-conformation of n-butane is

Options

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

Answer

A

Explanation

The dihedral angle is measured relative to two methyl groups:

The `Me` groups are as far apart as they can be. Thus, the dihedral angle is `180^(@)`