Question

What is the torsion angle in the staggered conformation of ethane?

• A. 45°
• B. 180°
• C. 60°
• D. 0°

Hint:

In the staggered conformation of ethane, the torsion angle between the hydrogen atoms attached to each carbon atom is 60°, minimizing steric repulsion.

Answer 1

The Correct Option is C

Step 1: Understanding the staggered conformation.
In the staggered conformation of ethane, the carbon-hydrogen bonds are as far apart as possible, with a torsion angle of 60°. This minimizes the steric repulsion between atoms, making it the most stable conformation.
Step 2: Analyzing the options.
(A) 45°: Incorrect. This is not the correct torsion angle for the staggered conformation.
(B) 180°: Incorrect. This is the angle for the eclipsed conformation, not the staggered one.
(C) 60°: Correct — The torsion angle in the staggered conformation of ethane is 60°.
(D) 0°: Incorrect. This is the angle for the eclipsed conformation.
Step 3: Conclusion.
The correct answer is (C) 60°, which is the torsion angle in the staggered conformation of ethane.