Question

Which of the following statements is not correct for sigma and pi bond 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 energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol. respectively.

Answer 2

Since $\pi$ bond is weaker than s bond the stated value of bond energies are wrong.