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.
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.