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

• A
  Sigma-bond is stronger than a $\pi$-bond
• B
  Bond energies of sigma and $\pi$-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 $\pi$-bond
• D
  Sigma-bond determines the direction between carbon atoms but a $\pi$-bond has no primary effect in this regard