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Chapter 5: Problem 20

Do all resonance forms of a molecule have the same molecular geometry? Explain your answer.

Short Answer

Expert verified
Answer: Yes, all resonance structures of a molecule have the same molecular geometry, as they only differ in electron distribution and not in the connectivity of atoms. The molecular geometry remains invariant across all resonance structures, as the actual structure of the molecule is an average of all these forms.

Step by step solution

01

Definition of Resonance Structures

Resonance structures are different Lewis structures that represent the same molecule, where electrons are delocalized across different atoms in the structure. They are used to depict how the electrons are distributed in a molecule when a single Lewis structure is unable to accurately describe the observed properties of the molecule.
02

Molecular Geometry

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule, which plays a crucial role in determining the properties and reactivity of the molecule.
03

Relationship between Resonance Structures and Molecular Geometry

Although resonance structures depict different ways of distributing electrons within the same molecule, they do not lead to significant changes in the arrangement of atoms. This is because resonance structures only differ in electron distribution, not the connectivity of atoms.
04

Invariance in Molecular Geometry

As we established that resonance structures only differ in electron distribution and the connectivity of atoms remains the same, it means that the molecular geometry stays the same across all resonance forms of a molecule. This invariance in molecular geometry can be explained by the fact that resonance structures require minimal energy changes to convert from one form to another and that the real structure of the molecule is an average of these forms.
05

Conclusion

All resonance forms of a molecule do have the same molecular geometry because the resonance structures only differ in electron distribution, without any changes in the connectivity of the atoms. The molecular geometry remains invariant across all resonance structures, as the real structure of the molecule is an average of all these forms.

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