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  4. In the following the most stable conformation n-butane is

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Q. In the following the most stable conformation $n$-butane is

AIPMTAIPMT 2010Hydrocarbons

Solution:

The conformation in which the heavier groups are present at maximum possible distances, so that the forces of repulsion get weak, is more stable.
Among the given conformations of n-butane, the conformation shown in option
(b), i.e. anti conformation is most stable as in it the bulkier group, i.e. - $CH_3$ group are present at maximum possible distance and get lower energy.