Question

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

• A. Sigma-bond is stronger than a pi-bond
• B. Bond energies of sigma- and pi-bonds are of the order of 264 KJ/mol and 347 KJ/mol, respectively
• C. Free rotation of atoms about a sigma bond is allowed but not in case of a pi-bond
• D. Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard

Answer 1

Answer: (B)

Bond energies of sigma- and pi-bonds are of the order of 264 KJ/mol and 347 KJ/mol, respectively

Answer 2

Option (B) is not correct. The bond energies of sigma- and pi-bonds are not of the order mentioned in option (B).
In reality, sigma bonds are generally stronger than pi bonds. The typical bond energy for a sigma bond is higher than that for a pi bond. The values for bond energies can vary depending on the specific compounds and circumstances, but the order of bond strength is generally sigma > pi.

So, the correct option is (B): Bond energies of sigma- and pi-bonds are of the order of 264 KJ/mol and 347 KJ/mol, respectively