Select all Newman projections that are valid Newman projections for stable conformations of butane. ("Stable" means located at any energy minimum in a plot of energy vs. dihedral angle.)

Question

Select all Newman projections that are valid Newman projections for stable conformations of butane. ("Stable" means located at any energy minimum in a plot of energy vs. dihedral angle.)
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Quizplus · Accepted Answer

The Answer is A, B, and D. Projection B is a projection of the C1-C2 bond, whereas the other correct projections are projections of the C2-C3 bond. Projection C is not butane, and projection E is not a stable conformation of butane. Although the gauche conformation D is less stable than the anti conformation A, it lies at an energy minimum and certainly exists.

Select All Newman Projections That Are Valid Newman Projections for Stable