Question

What will be the rotation angle to cohvert anti conformation into Gauche conformation in n-butane
A) 60
120
180
360​

Answer 1

$Required \: Answer$

120

Eclipsed conformer can be converted back into gauche conformation by rotating it 60 degrees and when an eclipsed is rotated by 180 degrees it forms anti- conformer. Rotation of anti butane by 120 degrees again leads to the formation of the gauche conformer.