Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?
sigma-bond is stronger than a pi-bond.
Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively
Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
