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

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

Correct answer: Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively

Solution

The bond energy of a sigma bond is generally higher than that of a pi bond, contrary to the values given in option C. This makes option C incorrect.

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