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Q.

Arrange the following conformational isomers of n-butane in order of their increasing potential energy

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a

II < IV < III < I

b

I < III < IV < II

c

II < III < IV < I

d

I < IV < III < II

answer is D.

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Detailed Solution

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The order of potential energy of above conformations is

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The fully eclipsed form is least stable due to repulsion between bulky (—CH3) methyl group at front and rear carbon atom.

∴ It has maximum potential energy.

While the repulsion in anti form is minimum.

∴ It has minimum potential energy.

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