In the given conformation,if C_2 is rotated a | vedclass

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(C) The given structure is a Newman projection of butane. In the initial conformation,the two $CH_3$ groups are anti to each other ($180^{\circ}$ apar

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Gauche conformation

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(C) The given structure is a Newman projection of butane. In the initial conformation,the two $CH_3$ groups are anti to each other ($180^{\circ}$ apart). Rotating the front carbon $(C_2)$ anticlockwise by $120^{\circ}$ moves the $CH_3$ group from the bottom position to the position $120^{\circ}$ away from the back $CH_3$ group. In this new position,the $CH_3$ group on $C_2$ is at a $60^{\circ}$ dihedral angle with respect to the $CH_3$ group on $C_3$. This specific arrangement,where the bulky groups are at a $60^{\circ}$ dihedral angle,is known as the Gauche conformation.

In the given conformation,if $C_2$ is rotated about the $C_2-C_3$ bond anticlockwise by an angle of $120^{\circ}$,then the conformation obtained is:

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