Question

What is the dihedral angle in eclipsed conformation of ethane molecule?

• A. $0^{\circ }$
• B. ${60}^{\circ }$
• C. ${120}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

The correct option is A $0^{\circ }$

A conformation where atoms/substituents attached to two carbons are as close together as possible is known as eclipsed conformation.
The angle between two planes, where each plane is defined by three atoms is known as dihedral angle. In eclipsed conformation of ethane molecule the dihedral angle is $0^{\circ }$. So, the correct answer is option (a).