The correct order of relative stability of th | vedclass

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(A) The given structures represent the Newman projections of $n$-butane.Structure $II$ is the anti-conformer,where the two bulky $-CH_3$ groups are at

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$II > I = III$

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(A) The given structures represent the Newman projections of $n$-butane.Structure $II$ is the anti-conformer,where the two bulky $-CH_3$ groups are at a dihedral angle of $180^{\circ}$,minimizing steric repulsion.Structures $I$ and $III$ are gauche-conformers,where the two $-CH_3$ groups are at a dihedral angle of $60^{\circ}$,leading to higher steric repulsion compared to the anti-form.Since both $I$ and $III$ are equivalent gauche-conformers,they have equal stability.Thus,the order of stability is $II > I = III$.

The correct order of relative stability of the given conformers of $n$-butane is

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