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Q.

Which of the following conformations of butane has the lowest energy?

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a

Anti

b

Gauche

c

Eclipsed

d

Staggered

answer is A.

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Detailed Solution

Since the potential energy is lowest in the anti-conformation of butane (where the dihedral angle equals 1800), it is also the most stable. This occurs as a result of the methyl groups being the furthest apart in the molecule.

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