Which of the following is most energetic conformation of cyclohexane?

Options

A. Half - chair
B. Boat
C. Twisted-boat
D. Chair

Answer

A

Explanation

The half - chair can be attained by moving the carbons `C_(1),C_(2)C_(3)` and `C_(4)` of a chair conformation into one plane and `C_(6)` above the plane and `C_(5)` below the plane. It contains manu eclipsed carbon- hydrogen bonds. The half chair conformer lies about `10.8` kcal above the chair form.