Chemical Bonding And Molecular Structure Ques 20
20. Which of the following statements is not correct for sigma and pi-bonds formed between two carbon atoms?
[2003]
(a) Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard
(b) Pi-bond is stronger than a sigma-bond
(c) Bond energies of sigma- and pi-bonds are of the order of $264 , \text{kJ} , \text{mol}^{-1}$ and $347 , \text{kJ} , \text{mol}^{-1}$, respectively
(d) Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond
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Solution:
- (c) As sigma bond is stronger than the $\pi$ (pi) bond, so it must have higher bond energy than $\pi$ (pi) bond.
BETA
