1. 120^° 2. 180^° 3. 60^° 4. 0^°

Topic: Alkanes: conformations, halogenation mechanism· Hydrocarbons

Dihedral angle of least stable conformer of ethane is :

1. \(120^\circ\)

2. \(180^\circ\)

3. \(60^\circ\)

4. \(0^\circ\)

Doubtly Asked 30 Oct 2026 NEET UG 2021 Practice test neet Save WhatsApp Report

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Answer: 4. \(0^\circ\)

Key idea: the eclipsed conformation of ethane has the highest torsional strain, so it is least stable.

In the eclipsed form the C-H bonds on the two carbons are directly in line, so the dihedral angle is \(0^\circ\). The staggered form (\(60^\circ\)) is most stable.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Dihedral angle of least stable conformer of ethane is :

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