(C) The stability of conformers of $n$-butane follows the order: Anti > Gauche > Eclipsed.In the anti-conformer,the two bulky methyl $(-CH_3)$ groups

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(C) The stability of conformers of $n$-butane follows the order: Anti > Gauche > Eclipsed.In the anti-conformer,the two bulky methyl $(-CH_3)$ groups are at a dihedral angle of $180^{\circ}$,which minimizes steric repulsion and torsional strain.Image $817-c1436$ represents the anti-conformer,where the two $-CH_3$ groups are opposite to each other.