fall06org1q2

fall06org1q2 - bond. Fall06org1q2 Page1 11-13) Circle the...

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Fall 06: Quiz 2. Ch 4-6 20points N a m e If you do not want your graded quiz placed in the box outside my office, then please tick here (1-10) are True or False. 1) E2 and E1 are two different mechanistic processes for elimination reactions. 2) Activation energy barriers are what control the speed of reaction steps. 3) Sterically bulky anions show reduced nucleophilicity because electron / electron repulsions hinder the approach of the nucleophile to the electrophilic center. 4) A favorable entropy change results from an increase in disorder. 5) Racemic mixtures contain equal amounts of enantiomers. 6) This molecule has an R stereocenter. CO 2 CH 3 CH 3 H 3 C Cl H CO 2 CH 3 7) This molecule is chiral. OH HO 8) These compounds are enantiomers. H Br CF 3 F F Br H CH 3 9) S N 2 and E2 reactions both involve carbocation intermediates. 10) A nucleophilic substitution reaction always forms a new
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Unformatted text preview: bond. Fall06org1q2 Page1 11-13) Circle the species in each pair which would undergo faster S N 1 reactions. 11) Br Br 12) O O H H H + 13) Cl 14) State the Saytzeff Rule concerning eliminations. 15-16) After a carbocation has been formed, name all four possible things can happen. 17) How many R chiral centers are in this molecule ? Br H CH 3 H 3 C Br H Fall06org1q2 Page2 18) What is the definition of a diastereomer ? 19-20) Draw the two possible isomeric products from the elimination of HBr from the following molecule. Br- HBr * BONUS QUESTION for 1 extra point * In your answer to (19-20), indicate which of the two products would be the MAJOR product, and which would be the MINOR product. Fall06org1q2 Page3...
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fall06org1q2 - bond. Fall06org1q2 Page1 11-13) Circle the...

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