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Question

Sort the following butane conformations according to stability.

A
Anti form
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B
Fully eclipsed
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C
Partial eclipsed
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D
Gauche form
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Solution

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.

There are infinite possibilities in between staggered and eclipsed conformations by rotating the C-C bond.


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