Answer the following questions for the MOs of 1,3-butadiene: a. Which are pie bonding MOs, and which are p* antibonding MOs? b. Which MOs are symmetric, and which are antisymmetric? c. Which MO is the HOMO and which is the LUMO in the ground state? d. Which MO is the HOMO and which is the LUMO in the excited state? e. What is the relationship between the HOMO and the LUMO and symmetric and antisymmetric orbitals?

Answer the following questions for the MOs of 1,3-butadiene: a. Which are pie bonding MOs, and which are p* antibonding MOs? b. Which MOs are symmetric, and which are antisymmetric? c. Which MO is the HOMO and which is the LUMO in the ground state? d. Which MO is the HOMO and which is the LUMO in the excited state? e. What is the relationship between the HOMO and the LUMO and symmetric and antisymmetric orbitals?

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter14: Conjugated Compounds And Ultraviolet Spectroscopy

Section14.SE: Something Extra

Problem 52AP

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Answer the following questions for the MOs of 1,3-butadiene: a. Which are p bonding MOs, and which are p* antibonding MOs? b. Which MOs are symmetric, and which are antisymmetric? c. Which MO is the HOMO and which is the LUMO in the ground state? d. Which MO is the HOMO and which is the LUMO in the excited state? e. What is the relationship between the HOMO and the LUMO and symmetric and antisymmetric orbitals?
Answer the following questions for the MOs of 1,3,5-hexatriene: a. Which are bonding MOs, and which are antibonding MOs? b. Which MOs are the HOMO and the LUMO in the ground state? c. Which MOs are the HOMO and the LUMO in the excited state? d. Which MOs are symmetric, and which are antisymmetric? e. What is the relationship between HOMO and LUMO and symmetric and antisymmetric MOs?
Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene: a. How many MOs does the compound have? b. Which are the bonding MOs, and which are the antibonding MOs? c. Which MOs are symmetric, and which are antisymmetric? d. Which MO is the HOMO and which is the LUMO in the ground state? e. Which MO is the HOMO and which is the LUMO in the excited state? f. What is the relationship between HOMO and LUMO and symmetric and antisymmetric orbitals? g. How many nodes does the highest-energy MO of 1,3,5,7-octatetraene have between the nuclei?
The most stable MO of 1,3,5-hexatriene and the most stable MO of benzene Which compound is more stable? Why?
(a) Draw the molecular orbital picture for propa-1,2-diene, H2C=C=CH2. Hint: The three-dimensional geometry is shownin the chapter. (b) Draw the MO energy diagram for propa-1,2-diene. What is the HOMO? What is the LUMO?
The pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?(c) How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?(d) Draw the MOs of the pentadienyl system in order of increasing energy. (continued)762 CHAPTER 15 Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy(e) Show how many electrons are in each MO for the pentadienyl radical (ground state).(f) Show how your molecular orbital picture agrees with the resonance picture showing delocalization of the unpairedelectron onto three carbon atoms.(g) Remove the highest-energy electron from the pentadienyl radical to give the pentadienyl cation. Which carbon atomsshare the positive charge? Does this picture agree with the resonance picture?(h) Add an…
The pentadienyl radical, H2C“CH¬CH“CH¬CH2#, has its unpaired electron delocalized over three carbon atoms.(a) Use resonance forms to show which three carbon atoms bear the unpaired electron.(b) How many MOs are there in the molecular orbital picture of the pentadienyl radical?(c) How many nodes are there in the lowest-energy MO of the pentadienyl system? How many in the highest-energy MO?(d) Draw the MOs of the pentadienyl system in order of increasing energy
Answer the following questions for 1,3,5- hexatriene, the conjugated triene containing six carbons.Which MOs are bonding? Which are antibonding?
(a) How many π molecular orbitals are present in deca-1,3,5,7,9-pentaene (CH2 = CH – OH = OH – CH = CH – OH = OH – CH = CH2)? (b) How many are bonding MOs and how many are antibonding MOs? (c) How many nodes are present in ψ1? (d) How many nodes are present in ψ10*
Draw the energy diagram for cyclooctatetraene dianion , C8H8 (2-) , molecular orbitals. The polygon rule is helpful. Label each MO as bonding , antibonding, or nonbonding, and add the nonbonding line. Identify the LOMO, HOMO, LUMO and HUMO orbitals. Is this dianion aromatic , non aromatic or anti aromatic? Thank you!
A)Draw the AO Contribution picture of CH3CH2+ and the MO energy diagram. B) What is HOMO and what is LUMO?
Tips on how to approach a Diels Alder problem like this.