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