What would you call this conformation of butane?

Chair

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Boat

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Totally eclipsed

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Partially eclipsed

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Gauche

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Anti

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Solution

The correct option is E
Gauche

I and VII, II and VI, III and V are same.

Energy vs. Dihedral agle or angle of rotation diagram:

Mainly three conformational isomers of butane

Stability order: Staggered > Gauche (Skew) > Eclipsed.

All other infinite possibilities in between staggered and eclipsed conformations are known as skew (Gauche) form.

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