Dihedral angle of least stable conformer of ethane is :
120^{\circ}
180^{\circ}
60^{\circ}
0^{\circ}
Ethane has two conformers: (i) Eclipsed and (ii) Staggered. The eclipsed conformer is the least stable while the staggered conformer is the most stable. In the eclipsed conformer, the dihedral angle is 0^{\circ}.
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