Question

Given below are two statements regarding conformations of n-butane. Choose the correct option. 

• A. Both Statement I and Statement II are false
• B. Statement I is false but Statement II is true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are true

Hint:

Anti-staggered conformations are always the most stable in alkanes.

Answer 1

The Correct Option is D

Step 1: Stability of conformers.
In n-butane, the eclipsed conformation is the least stable due to maximum torsional strain, while the anti-staggered conformation is the most stable.
Step 2: Effect of dihedral angle.
As the dihedral angle increases from eclipsed to staggered, torsional strain decreases, increasing stability.
Step 3: Conclusion.
Both statements correctly describe conformational behavior of n-butane.