Question

What is the dihedral angle in the anti-conformation of n-butane?

• A. 60
• B. 120
• C. 180

Answer 1

The correct option is C 180

Dihedral angle or torsional angle it is the angle between planes through two sets of three atoms, having two atoms in common.



To understand this clearly, consider the newman projection of n-butane. Can you visualize the angle between the methyl groups? That is the dihedral angle.

For the anti-conformation, we would have the angle to be ${180}^o$