Which one of following statements is not correct of sigma- and $\mathrm{Pi}-$ bonds formed between two…
Which one of following statements is not correct of sigma- and $\mathrm{Pi}-$ bonds formed between two carbon atoms?
Sigma-bond is stronger than a pi-bond
Bond energies of sigma-and pi-bonds are of the order of $264 \mathrm{~kJ} / \mathrm{mol}$ and $347 \mathrm{~kJ} / \mathrm{mol}$, respectively
Free rotation of atoms about a sigma bond is allowed but not in case of a pi-bond
Sigma bond determines the direction between carbon atoms but a pi-bond has no primary effect in the regard
Solution
Bond energies of sigma and pi-bonds are of the order of $264 \mathrm{~kJ} / \mathrm{mol}$ and $347 \mathrm{~kJ} / \mathrm{mol}$ respectively as bond energy of sigma bond is greater than pi bond.
Related Theory
A sigma bond is stronger because of the head to head overlapping, while a pi bond is weaker because of side to side overlapping. A sigma bond requires more energy to break than a pi bond does.
