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State (Phase) of Alkanes

Rotation arou...

Question

Rotation around carbon - carbon single bond of ethane is not completely free. Discuss.

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Solution

Rotation around C—C single bond is not completely free and it is hindered by a small energy barrier of 1-20 kj/mol due to weak repulsive interaction between the adjacent bonds. Such type of repulsive interaction is called torsional strain

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