JEE Main · 2021 · 27 Jul 2021 · Shift 1 · General Organic Chemistry

Staggered and eclipsed conformers of ethane are:

(A)Mirror images
(B)Polymers
(C)Enantiomers
(D)Rotamers✓ Correct

Answer: (D)

Solution

Rotamers (or conformers) arise due to free rotation along a

σ

-bond. In ethane, rotation about the C–C single bond generates different spatial arrangements of the hydrogen atoms. The staggered and eclipsed conformations are rotamers — they differ only in the angle of rotation about the C–C bond, not in connectivity or stereochemistry.

JEE Main · 2021 · 27 Jul 2021 · Shift 1 · Single correct option

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