A) Sigma-bond determines the direction between carbon atoms but a pi-bond has no primary effect in this regard.
B) Sigma-bond is stronger than a pi-bond.
C) Bond energies of sigma- and pi-bonds are of the order of 264 kJ/mol and 347 kJ/mol, respectively.
D) Free rotation of atoms about a sigma-bond is allowed but not in case of a pi-bond.
Correct Answer: C
Solution :
[c] As sigma bond is stronger than the \[\pi \] (pi) bond, so it must be having higher bond energy than \[\pi \] (pi) bond.
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