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Organic Chemistry Main Menu Lecture 1: Introduction to Molecular Orbitals Lecture 10: Intermolecular Forces and Intro to Reactivity Lecture 11: Alkenes as Nucleophiles I Lectures 12 and 13: Alkenes II & III Lecture 14: Benzenes as Nucleophiles I Lecture 15 objectives and skills Lecture 2: Molecular Orbitals in Organic Structures Lecture 3: Molecular Orbitals and Resonance Lecture 4: Molecular Orbitals and Aromaticity Lecture 5: Nomenclature and IR Spectroscopy Lecture 6: Stereochemistry I Lecture 7: Stereochemistry II Lecture 8: Newman and Fisher Projections Lecture 9: Conformations and Cyclohexane Rings

SOLUTION 3.4

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title	dcterms:title	SOLUTION 3.4
content	sioc:content	Benzene has a higher λ_max than CH₂=CH₂owing to its conjugated system of double bonds, making the spacing between HOMO and LUMO a smaller energy gap, while the ethene does not have any conjugated doubles, so it has a larger HOMO-LUMO energy gap.
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Lecture 3: Molecular Orbitals and Resonance 12 image_header 2020-03-21T15:30:09-07:00
Objectives ans Skills

KEY INFORMATION SUMMARY

HERE you can find extra resources to help you with this lecture!

PROBLEMS

Problem 3.1: Resonance Structures
1. Determine whether the following pairs of compounds are resonance structures or structural isomers. SOLUTION
2. Insert curved arrows to show movement of electrons between those pairs that are resonance structures. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 3.2: Resonance Contributing Structures

Draw all the possible resonance structures and predict the best contributing one for each of the following species (include curved arrows). SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 3.3: p-Systems

For each of the following species, draw the resonance hybrid and p-orbital view, determine the number of p AOs, p MOs, p-electrons and MOs for the whole molecule. SOLUTION
If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the problem below ;)

Problem 3.4: UV-Vis Spectroscopy

Explain why benzene (C₆H₆) has a higher l_max than CH₂=CH₂. SOLUTION

If you made some mistakes or want to practice more, review the concepts that gave you trouble and work on this extra problem. If you're good, move to the next lecture ;)