Carbon–carbon double bonds do not undergo rotation as do carbon–carbon single bonds. The reason is that
(a) The double bond is much stronger and thus more difficult to rotate
(b) Overlap of the sp2 orbitals of the carbon–carbon σbond would be lost
(c) Overlap of the p orbitals of the carbon–carbon π bond would be lost
(d) The shorter bond length of the double bond makes it more difficult for the attached groups to pass one another
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