All of the following are correct statements regarding difference between sigma bond and pi-bond EXCEPT:
Correct answer: D. All are correct.
- A. Sigma bonds are stronger than pi bonds
- B. Pi bonds are weaker than sigma bonds
- C. in a carbon-carbon double bond, there is one sigma bond and one pi bond.
- D. All are correct.
Explanation
Option D is correct.Sigma bonds are stronger than pi bonds because the head-on overlap of orbitals results in a greater degree of overlap. This means that the electrons are more strongly attracted to both nuclei, which makes the bond stronger. Pi bonds are weaker than sigma bonds because the side-by-side overlap of orbitals results in less overlap. This means that the electrons are not as strongly attracted to both nuclei, which makes the bond weaker. A carbon-carbon double bond has one sigma bond and one pi bond. The sigma bond is formed by the head-on overlap of two sp2 hybridized orbitals on the carbon atoms. The pi bond is formed by the side-by-side overlap of two p orbitals on the carbon atoms. The sp2 hybridized orbitals are oriented at 120 degrees to each other, which gives the carbon-carbon double bond a trigonal planar shape. The p orbitals are perpendicular to the plane of the sp2 orbitals, which gives the pi bond a linear shape.
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Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
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