Which of the following statements is incorrect for sigma and $\mathrm{\pi }$-bonds formed between two carbon atoms?

• A

  Sigma-bond is stronger than a $\mathrm{\pi }$-bond

• B

  Bond energies of sigma and $\mathrm{\pi }$-bonds are of the order of 264 kJ/mol and 347 kJ/mol

• C

  Free rotation of surrounding atoms about a sigma-bond is allowed but not in case of a $\mathrm{\pi }$-bond

• D

  Sigma-bond determines the direction between carbon atoms but a $\mathrm{\pi }$-bond has no primary effect in this regard