Arrange the following conformational isomers of n - butane in order of their increasing potential energy :

Options

A. I lt III lt IV lt II
B. I lt IV lt III lt II
C. II lt IV lt III lt I
D. II lt III lt IV lt I

Answer

A

Explanation

The order potential energy of above conformations is
Fully eclipsed > Partial eclipsed > Gauche > Anti.