The correct statement regarding ethane conformation is :

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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.

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.

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

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.

answer is C.

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Detailed Solution

Rotation about C – C bond is possible because of cylindrical symmetry of sigma bond between carbon atoms. Infinite number of conformations are possible due to these rotations.

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