NEET · Chemistry · STD 11 - 8.2 Organic chemistry isomerism

The correct statement regarding ethane conformation is :

A Rotation around carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains a pi \((\pi)\) bond between the carbon and carbon and ethane has very low melting point.
B Rotation around carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains both sigma \((\sigma)\) bond, and pi \((\pi)\) bond between the carbon and carbon.
C Rotation around carbon-carbon bond in ethane molecule is possible because of cylindrical symmetry of sigma \((\sigma)\) bond between carbon-carbon atoms
D Rotation around carbon-carbon bond in ethane molecule is not possible, because ethane molecule contains both sigma \((\sigma)\) bond and pi \((\pi)\) bond between the carbon and carbon and ethane has very high boiling point.

Verified Solution

Answer & Solution

Correct Answer

(C) Rotation around carbon-carbon bond in ethane molecule is possible because of cylindrical symmetry of sigma \((\sigma)\) bond between carbon-carbon atoms

Step-by-step Solution

Detailed explanation

Rotation around carbon-carbon bond in ethane molecule is possible because of cylindrical symmetry of sigma \((\sigma)\) bond between carbon-carbon atoms

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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