Question

In gauche conformations, the methyl groups are ___________

(a) 60^0 apart

(b) 90^0 apart

(c) 180^0 apart

(d) 360^0 apart

This question was addressed to me during an interview.

This intriguing question originated from Conformations topic in division Structure and Stereostructure of Molecules of Engineering Chemistry I

Answer 1

Right choice is (a) 60^0 apart

Explanation: In gauche conformations, the methyl groups are 60^0 apart. In general a gauche rotamer is less stable than an anti-rotamer.