Concept explainers
Interpretation:
In order to describe the covelent bonds and the reasonsvalence bond method is better than the Lewis structures are to be explained.
Concept introduction:
The
Answer to Problem 1E
The valence bond theory is better thanthe Lewis theory on facts relating to sigma and pi bonds, the shape of molecules, rotation about double bonds and about odd electron species.
Explanation of Solution
Lewis theory and valence bond theoryexplainabout covalent bonding. But the main difference is that Lewis theory involves only valence electrons and the valence bond theory involves overlapping of orbitals having electrons.
Lewis theory considers covalent bonding to be sharing of electrons, unlike valence bond theory. Besides, Lewis theory does not involve hybridization or overlap of orbitals like valence bond theory where electrons pairin this process.
There are various ways by which thevalence bond theory is superior to Lewis structures while describing covalent bonds.
Some of them are explained as follows:
- There is a distinguishing feature between sigma and pi bonds. For instance, double bond appears as two bonds in Lewis theory and there is no indication if the double bond is stronger than a single bond. But valence bond theory clarifies that sigma bond is stronger than the pi bond.
- Valence bond theory gives geometry of the molecule as hybridization is involved while Lewis theory does not describe the geometry of the molecule.
- Valence bond theory explainsthe rotation within a double bond involving a cleavage of sigma bond while Lewis theory does not explain double bond rotation.
- Valence bond theory explains odd electron species.
Thus, the valence bond theory is superior to Lewis theory on facts relating to sigma and pi bonds, shape of molecules, rotation of double bonds and odd electron species.
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Chapter 11 Solutions
General Chemistry: Principles and Modern Applications - With Solutions Manual and Modified MasteringChemistry Code
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