In the given conformation is rotated about
bond anticlockwise by an angle of
then the formation obtained is

fully eclipsed conformation
partially eclipsed conformation
gauche conformation
staggered conformation

Anti conformation is changing to gauge after rotaion.
Anti conformation = Bulky groups present at angle of to each other.
Gauge conformation = Bulky groups present at an angle of to each other.
Therefore, option (3) is correct.
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