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Rotation around carbon-carbon single bon...

Rotation around carbon-carbon single bond of ethane is not completely free. Justify the statement.

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Rotation around C-C single bond is not completely free and it is restricted due to repulsions between the electron clouds of C-H bonds in the adjacent carbon atoms. Therefore, ethane exists in infinite number of conformations. Out of these, two extreme conformations are staggered and eclipsed.
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