Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN: 9781938168390
Author: Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher: OpenStax
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Chapter 8, Problem 1E

Explain how σ and π bonds are similar and how they are different.

Expert Solution & Answer
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Interpretation Introduction

Interpretation: To explain how the sigma (s) and pi (p) bonds are similar and different.

Concept introduction: A sigma bond is formed by the axial overlap of atomic orbitalsand the pi bonds are formed by the side-to-side overlap of p-orbitals.

Answer to Problem 1E

Similarities: Both sigma and pi bonds are formed by the overlapping of orbital and these bonds are covalent bonds.

Differences: Sigma bond is the strong bond whereas pi bond is weaker in comparison to sigma bond.

Pi bond is formed by the side to side overlapping of atomic orbital whereas sigma bond is formed by the linear (end to end) overlapping of atomic orbital.

Explanation of Solution

The sigma and pi both the bonds are formed by sharing of an electron pair that is both are covalent bonds. The sigma bond is formed when two orbitals overlap axially along the internuclear axis; it is strong bond as it requires very high energy to break. The sigma bonds of molecules give the shape of a molecule as per VSEPR model. The sigma bonds can rotate but the pi bonds cannot because if a pi bond is rotated it will break.

Therefore, the similarity between sigma and pi bonds are that both are formed by the overlap of orbital and both the bonds are covalent bonds that is it involves a bond pair. The difference between sigma and pi bonds are that sigma bond is the strongest bond while pi bonds are weaker as compared to sigma bond. Sigma bond is formed by linear overlap of atomic orbital while the pi bond is formed by side-to-side overlap of atomic orbital. Sigma bond gives the shape while a pi bond gives the length of a molecule. Sigma bond is free to rotate around its axis while the pi bond cannot rotate it is locked.

Conclusion

Similarities: Both sigma and pi bonds are formed by the overlapping of orbital and these bonds are covalent bonds.

Differences: Sigma bond is the strong bond whereas pi bond is weaker in comparison to sigma bond.

Pi bond is formed by the side to side overlapping of atomic orbital whereas sigma bond is formed by the linear (end to end) overlapping of atomic orbital.

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Chapter 8 Solutions

Chemistry by OpenStax (2015-05-04)

Ch. 8 - Explain why a carbon atom cannot form five bonds...Ch. 8 - What is the hybridization of the central atom in...Ch. 8 - A molecule with the formula AB3 could have one of...Ch. 8 - Methionine, CH3SCH2CH2CH(NH2)CO2H, is an amino...Ch. 8 - Sulfuric acid is manufactured by a series of...Ch. 8 - Two important industrial chemicals, ethene, C2H4,...Ch. 8 - For many years after they were discovered, it was...Ch. 8 - Consider nitrous acid, HNO2 (HONO). (a) Write a...Ch. 8 - Strike-anywhere matches contain a layer of KClO3...Ch. 8 - Identify the hybridization of each carbon atom in...Ch. 8 - Write Lewis structures for NF3 and PP5. On the...Ch. 8 - In addition to NF3, two other fluoro derivatives...Ch. 8 - The bond energy of a C—C single bond averages 347...Ch. 8 - For the carbonate ion, CO32, draw all of the...Ch. 8 - A useful solvent that will dissolve salts as well...Ch. 8 - For the molecule allene, H2C=C=CH2, give the...Ch. 8 - Identify the hybridization of the central atom in...Ch. 8 - Describe the molecular geometry and hybridization...Ch. 8 - For each of the following molecules, indicate the...Ch. 8 - For each of the following structures, determine...Ch. 8 - Draw the orbital diagram for carbon in CO2 showing...Ch. 8 - Sketch the distribution of electron density in the...Ch. 8 - How are the following similar, and how do they...Ch. 8 - If molecular orbitals are created by combining...Ch. 8 - Can a molecule with an odd number of electrons...Ch. 8 - Can a molecule with an even number of electrons...Ch. 8 - Why are bonding molecular orbitals lower in energy...Ch. 8 - Calculate the bond order for an ion with this...Ch. 8 - Explain why an electron in the bonding molecular...Ch. 8 - Predict the valence electron molecular orbital...Ch. 8 - Determine the bond order of each member of the...Ch. 8 - For the first ionization energy for an N2...Ch. 8 - Compare the atomic and molecular orbital diagrams...Ch. 8 - Which of the period 2 homonuclear diatomic...Ch. 8 - A friend tells you that the 2s orbital for...Ch. 8 - True or false: Boron contains 2s22p1 valence...Ch. 8 - What charge would be needed on F2 to generate an...Ch. 8 - Predict whether the MO diagram S2 would show s-p...Ch. 8 - Explain why N22+ is diamagnetic, while O24+, which...Ch. 8 - Using the MO diagrams, predict the bond order for...
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