Question

Which one of the following statements is not correct 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 $264\text{kJ/mol}$ and $347\text{kJ/mol}$, respectively
• C. Free rotation of 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

Answer 1

The correct option is B Bond energies of sigma- and pi-bonds are of the order of $264\text{kJ/mol}$ and $347\text{kJ/mol}$, respectively

Sigma bond dissociation energy $=347\text{kJ/mol}$ Pi-bond dissociation energy $=264\text{kJ/mol}$