chem3A-spring_2007-mt1-Frechet-exam

chem3A-spring_2007-mt1-Frechet-exam - Practice Exam #1 2009...

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Practice Exam #1 © 2009 J.M.J. Fréchet, Berkeley, CA. All rights reserved. Page 1 of 10 1. (11 Points) (a) Draw the skeletal structures (showing only C-C bonds) of all constitutional isomers of octane with only five carbon atoms in their main chain. Do not write extra or duplicate structures! (b) Which of the following molecules is represented by the Newman projection: (c) Answer = CH 2 CH 2 CH 3 H 3 C CH 2 CH 3 CH 2 CH 3 H CH 3
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Practice Exam #1 © 2009 J.M.J. Fréchet, Berkeley, CA. All rights reserved. Page 2 of 10 2. ( 12 Points) (a) What is the formal charge on each atom. Place each individual answer in the box provided at the end of the arrow. (b) Draw all the possible resonance forms for the benzyl cation. (c) Which of the following pairs are NOT resonance structures of each other? (d) Name the fuel used in jet engines (e) Name the catalyst mentioned in lecture used for cracking alkanes. Br C N CH 2 HCOH O O and A B H 2 CCCH H 2 O NH 2 O NH 2 O CH 2 O CH 2 C E D and and and All are pairs of resonance structures Answer(s): Answer: Answer:
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Practice Exam #1 © 2009 J.M.J. Fréchet, Berkeley, CA. All rights reserved. Page 3 of 10 3. (11 Points) (a) Show the major product for each of the monohalogenation reactions below (b) Sketch a complete and fully labeled potential energy diagram for the formation of CH 3 Cl from methane and chlorine. You can assume that chlorine radicals are always available to start the reaction. (make sure the diagram is fully legible, use all the space provided) Br 2 light Cl 2 light
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Practice Exam #1 © 2009 J.M.J. Fréchet, Berkeley, CA.
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chem3A-spring_2007-mt1-Frechet-exam - Practice Exam #1 2009...

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