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Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
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Tutti i libri di testoMullins 1st EditionCh. 10 - Alkynes: Electrophilic Addition and Redox ReactionsProblema 43a
Capitolo 9, Problema 43a

Draw the molecular orbital picture of pent-1-en-3-yne.
Molecular structure of pent-1-en-3-yne with numbered carbon atoms 1, 3, and 4 highlighted in pink.

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Step 1: Identify the structure of pent-1-en-3-yne. This molecule contains a five-carbon chain with a double bond at the first carbon and a triple bond at the third carbon. Write the condensed structural formula as CH₂=CH-C≡C-CH₃.
Step 2: Determine the hybridization of each carbon atom. The first carbon in the double bond is sp² hybridized, the second carbon in the double bond is sp² hybridized, the third carbon in the triple bond is sp hybridized, the fourth carbon in the triple bond is sp hybridized, and the fifth carbon is sp³ hybridized.
Step 3: Draw the molecular orbitals for each bond type. For the double bond, show one σ bond formed by the overlap of sp² orbitals and one π bond formed by the overlap of unhybridized p orbitals. For the triple bond, show one σ bond formed by the overlap of sp orbitals and two π bonds formed by the overlap of unhybridized p orbitals.
Step 4: Include lone pairs and any remaining orbitals. For sp² and sp hybridized carbons, show the unhybridized p orbitals that contribute to π bonding. For sp³ hybridized carbons, show the tetrahedral arrangement of σ bonds.
Step 5: Assemble the complete molecular orbital diagram, ensuring all bonds and orbitals are represented accurately. Highlight the delocalized π system if applicable, and confirm the geometry matches the hybridization of each atom.

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Molecular Orbitals

Molecular orbitals (MOs) are formed by the combination of atomic orbitals when atoms bond together. They can be classified as bonding, antibonding, or non-bonding orbitals, which influence the stability and reactivity of the molecule. Understanding MOs is crucial for visualizing electron distribution and predicting molecular properties.
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Review of Molecular Orbitals

Hybridization

Hybridization is the process of mixing atomic orbitals to create new hybrid orbitals that can form sigma bonds in a molecule. In pent-1-en-3-yne, the carbon atoms undergo sp2 and sp hybridization, which affects the geometry and bonding characteristics of the molecule. Recognizing the type of hybridization helps in drawing accurate molecular structures.
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Using bond sites to predict hybridization

Alkynes and Alkenes

Alkynes and alkenes are types of unsaturated hydrocarbons characterized by the presence of triple and double bonds, respectively. Pent-1-en-3-yne contains both a double bond (alkene) and a triple bond (alkyne), which significantly influence its reactivity and physical properties. Understanding these functional groups is essential for constructing the correct molecular orbital diagram.
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How to name alkenes and alkynes
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