The correct statement regarding ethane conformation is :

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

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