Which of the following conformations of n-but | vedclass

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(D) The stability of $n-$butane conformations is determined by torsional strain and steric hindrance.$1$. The $Anti$ conformation is the most stable b

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Fully eclipsed

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(D) The stability of $n-$butane conformations is determined by torsional strain and steric hindrance.$1$. The $Anti$ conformation is the most stable because the bulky methyl groups are $180^{\circ}$ apart,minimizing steric repulsion.$2$. The $Gauche$ conformation is less stable than $Anti$ due to steric repulsion between methyl groups at a $60^{\circ}$ dihedral angle.$3$. The $Eclipsed$ conformation (where methyl and hydrogen are eclipsed) has higher energy due to torsional strain.$4$. The $Fully 	ext{ } eclipsed$ conformation is the least stable because the two bulky methyl groups are directly aligned ($0^{\circ}$ dihedral angle),resulting in maximum steric repulsion and torsional strain.

Which of the following conformations of $n-$butane is the least stable?

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