NEET2003ChemistryChemical Bonding and Molecular StructureActual
Which one of following statements is not correct of sigma- and Pi - bonds formed between two carbon atoms?
Options
- ASigma-bond is stronger than a pibond
- BBond energies of sigma-and pi-bonds are of the order of 264 ~kJ / mol and 347 ~kJ / mol , respectively
- CFree rotation of atoms about a sigmabond is allowed but not in case of a pi-bond
- DSigma bond determines the direction between carbon atoms but a pi-bond has no primary effect in the regard
Correct answer
B. Bond energies of sigma-and pi-bonds are of the order of 264 ~kJ / mol and 347 ~kJ / mol , respectively
Step-by-step solution
Bond energies of sigma and pi-bonds are of the order of 264 ~kJ / mol and 347 ~kJ / 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.