Exam 3 - 2006 - HOUR EXAM THREE _ Chapters 1, 2, & 4...

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HOUR EXAM THREE TEST FORM "A" Name: _______________________ Chapters 1, 2, & 4 CH - 3411 November 11, 2005 100 Points Fall - 2005 I. Multiple Choice (90 Points) 1. Which is the strongest nucleophile? A) OH - B) CH 3 CH 2 O - C) D) CH 3 CH 2 OH E) H 2 O 2. Which reaction would you expect to have the largest energy of activation? H° (kJ mol -1 ) A) CH 3 · + CH 3 · → CH 3 CH 3 -378 B) CH 3 · + Br· → CH 3 Br -130 C) CH 4 + → CH 3 · + HI +142 D) CH 4 + Br· → CH 3 · + HBr +104 E) CH 4 + Cl· → CH 3 · + HCl +8 3. The hybridization state of the charged carbon in a carbocation is A) sp 4 B) sp 3 C) sp 2 D) sp E) s 4. I want a particular reaction with competing mechanisms to go mostly S N 2. What can I do? A) Decrease the polarity of the solvent. B) Decrease the reaction temperature. C) Increase the concentration of nucleophile. D) Use a charged nucleophile instead of a neutral one. E) All of the above. 5. You want to synthesize 2-methyl-1-butene from 2-chloro-2-methylbutane. Which reagent would you use? A) NaOH/H 2 O D) CH 3 CH 2 ONa/CH 3 CH 2 OH B) KOH/H 2 O E) (CH 3 ) 3 COK/(CH 3 ) 3 COH C) CH 3 ONa/CH 3 OH Page 1
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6. The major product of the following reaction would be: A) I B) II C) III D) IV E) An equimolar mixture of I and II. 7. Which of the following statements is true when used to compare the reaction of chlorine with isobutane and the reaction of bromine with isobutane? A) Bromine is the less reactive and the more selective. B) Chlorine is the less reactive and the more selective. C) Chlorine is the more reactive and the more selective. D) Bromine is the more reactive and the more selective. E) None of the above 8. Which free radical is most stable relative to the hydrocarbon from which it is formed? A) CH 3 CH 2 CH 2 · D) CH 2 =CH· B) (CH 3 ) 2 CH· E) C) (CH 3 ) 3 Page 2
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9. For which of the following reactions would the transition state most resemble the products? The following bond dissociation energies may be useful. (CH
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This note was uploaded on 04/17/2008 for the course CHEM 3411 taught by Professor Pohlman during the Spring '08 term at Saint Mary's University Texas.

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Exam 3 - 2006 - HOUR EXAM THREE _ Chapters 1, 2, & 4...

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