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Question

If this is Energy vs Dihedral angle graph of Butane, then I,II and III are respectively :


A

Fully Eclipsed , Gauche , Anti

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B

Fully Eclipsed, Anti, Gauche

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C

Anti, Eclipsed, Gauche

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D

Gauche, Anti, Eclipsed

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Solution

The correct option is B

Fully Eclipsed, Anti, 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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