Q.

Which of the following conformer of butane has minimum energy?

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a

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b

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c

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d

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answer is A.

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Detailed Solution

In the anti-conformation of butane(dihedral angle=180o) , the potential energy is at its lowest and it is the most stable.

This is due to the methyl group being farthest away from each other in the molecule.

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Which of the following conformer of butane has minimum energy?