Exam22009Key - Chemistry 30C UCLA Spring 2009 Midterm Exam...

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Unformatted text preview: Chemistry 30C UCLA Spring 2009 Midterm Exam II KEY On my honor, I have neither given nor received any aid on this exam Signature: Key Name: Key UCLA Student I. D. Number: Question Points --------------------------------------- 1 (24) --------------------------------------- 2 (18) --------------------------------------- 3 (10) --------------------------------------- 4 (24) --------------------------------------- 5 (24) --------------------------------------- 6 Extra Credit (10) --------------------------------------- Total Chemistry 30C, Spring 2009 Name: Key Page 1 CONCEPTS and THEORY 1. A. (6) Rank the reactivity of the following molecules towards electrophilic aromatic substitution. 1 = Most activated . 6 = Most deactivated NMe 2 NO 2 Bu NHAc F 1 2 3 4 5 6 B. (3) Does the Diels Alder reaction display Kinetic or Thermodynamic Control of stereochemistry? Kinetic (Thermodynamic would require a reversible reaction.) C. (3) Combining five p orbitals on adjacent carbon atoms creates how many molecular orbitals? Five D. (2) What does HOMO stand for? Highest Occupied Molecular Orbital E. (6) List 3 possible outcomes of photochemical activation of a molecule. Thermal relaxation Photon emission Fluorescence Phosphorescence Chemical reaction Bond cleavage Cis-Trans Isomerization Electron Transfer F. (4) If longer wavelength UVA radiation is better for getting a nice tan and both of these molecules absorb UVB radiation, explain which molecule would be a better sunscreen for tanning....
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Exam22009Key - Chemistry 30C UCLA Spring 2009 Midterm Exam...

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