Question

Which of the following statement is not correct for sigma and pi-bonds formed between two carbon atoms?

• A. Free rotation of atoms about a sigma bond is allowed but not in case of a pi-bond
• B. Sigma bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard
• C. Sigma bond is stronger than a pi-bond
• D. Bond energies of sigma and pi-bonds are of the order of $264\, kJ/mol$ and $347\, kJ/mol,$ respectively

Answer 1

Answer: (D)

Bond energy of sigma and pi fronds are not of the order of $264\, kJ/mol$ and $347\, kJ/mol$ respectively. The bond energy of $C - C$ is $347 \,kJ/mol$ and of $C = C$ is $619\, kJ/mol$.