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
Correct Answer: D
Solution :Bond energy of sigma and pi bonds are not of the order of 264 kJ/mol and 347 kJ/mol respectively. The bond energy of C-C is 347 k J/mol and for C = C is 619 kJ/mol.
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