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Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.8 - Covalent Compounds: Bonding Theories and Molecular StructureProblema 115a
Capitolo 8, Problema 115a

Cyclooctatetraene dianion, C8H82-, is an organic ion with the structure shown. Considering only the p bonds and not the s bonds, cyclooctatetraene dianion can be described by the following energy diagrams of its p molecular orbitals:
(a) What is the hybridization of the 8 carbon atoms?

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Identify the bonding in cyclooctatetraene dianion, focusing on the carbon atoms. Each carbon atom in the ring is involved in three bonds: two sigma (σ) bonds with adjacent carbon atoms and one sigma bond with a hydrogen atom.
Recognize that each carbon atom also participates in a pi (π) bonding system, which involves the p orbitals that are perpendicular to the plane of the molecule.
Determine the hybridization necessary to accommodate these bonding arrangements. Since each carbon atom forms three sigma bonds, the hybridization of the orbitals involved in these bonds must allow for three hybrid orbitals.
Recall that sp2 hybridization involves the mixing of one s orbital and two p orbitals, resulting in three sp2 hybrid orbitals. The remaining p orbital, which is not involved in the hybridization, participates in the pi bonding.
Conclude that the hybridization of the carbon atoms in cyclooctatetraene dianion is sp2, allowing each carbon to form three sigma bonds using the sp2 hybrid orbitals and one pi bond using the unhybridized p orbital.

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Hybridization

Hybridization is the concept in chemistry that describes the mixing of atomic orbitals to form new hybrid orbitals, which can accommodate the bonding requirements of atoms in a molecule. In the case of cyclooctatetraene dianion, understanding hybridization helps determine the geometry and bonding characteristics of the carbon atoms involved. For carbon atoms, common hybridizations include sp, sp2, and sp3, which correspond to different types of bonding and molecular shapes.
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Hybridization

Molecular Orbitals

Molecular orbitals are formed by the combination of atomic orbitals when atoms bond together. In cyclooctatetraene dianion, the p molecular orbitals play a crucial role in determining the electronic structure and stability of the ion. The arrangement and energy levels of these orbitals influence the overall properties of the molecule, including its reactivity and resonance characteristics.
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Molecular Orbital Theory

Cyclooctatetraene Structure

Cyclooctatetraene is a cyclic compound with alternating double bonds, which can exhibit unique properties due to its structure. The dianion form, C8H8^2-, indicates that two electrons have been added, affecting the stability and hybridization of the carbon atoms. Understanding the structure of cyclooctatetraene is essential for analyzing its hybridization and the implications of its p bonding in the context of molecular orbital theory.
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Resonance Structures
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