Show what happens to the MO diagram of ethylene when the system absorbs a photon of UV light. 11 18 LUMO HOMO %23 TC ethylene ground state energy
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- Draw the potential energy profile of 3-ethyl-2-methylpentane as a function of the dihedral angle. (Conformational analysis is done with respect to the bond joining C2 and C3.)Answer the following questions for 1,3,5- hexatriene, the conjugated triene containing six carbons.Which MOs are bonding? Which are antibonding?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 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?1.The [CoCl4]2- anion is intensely blue colored and [CoCl6]4- is a lightly colored pink. explain breifly 2.Why is the method of descending symmetry needed to derive an mo diagram for acetylene (ethyne), but not needed for diazene((NH)2)?Which compoundshave zero dipole moments? cyclohexene or 1,2-dichlorocyclohexene
- 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?Does the MO energy diagram of cyclooctatetraeneConsider 1-bromopropane, CH3CH2CH2Br. (a) Draw a Newman projection for the conformation in which CH3 and -Br are anti (dihedral angle 180°). (b) Draw Newman projections for the conformations in which - CH3 and -Br are gauche (dihedral angles 60° and 300°). (c) Which of these is the lowest energy conformation? (d) Which of these conformations, if any, are related by reflection?
- Does chloromethane contain a plane of symmetry? Is it a chiral?What is the degree of unsaturation of C8H10ClNO? a. 4 b. 5 c. 6 d. 7Draw 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!
