Ex3Fl05Ans - Chemistry 310M/318M Dr. Brent Iverson 3rd...

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Unformatted text preview: Chemistry 310M/318M Dr. Brent Iverson 3rd Midterm Nov. 30, 2005 NAME (Print): _____________________________ SIGNATURE: _____________________________ Please Note: This test may be a bit long, but there is a reason. I would like to give you a lot of little questions, so you can find ones you can answer and show me what you know, rather than just a few questions that may be testing the one thing you forgot. I recommend you look the exam over and answer the questions you are sure of first , then go back and try to figure out the rest. Also make sure to look at the point totals on the questions as a guide to help budget your time. Note: You must have your answers written in blue or black pen if you want a regrade!!!! Do not take this in red ink, as that is what we will use to grade it! Please print the first three letters of your last name in the three boxes Please answer the following before you begin: Have you been to a recitation section since the last midterm? ____________ 10 9 8 7 6 5 4 3 2 (23) (12) (18) (20) (35) (27) (22) (22) (22) (19) (14) (15) (12) (261) 11 1 Page Points Total T Score HW 12 14 Pg 1 _____________(23) Signature_________________________ 1. (5 pts) Define Hammond's postulate in a concise fashion. Hammond's postulate says that the transition state for an exothermic step resembles the reactants more than the products of that step, and the structure of the transition state for an endothermic step resembles the products more than the reactants of that step. 2. (1-4 pts each) Consider the following statements that refers to S N 1, S N 2, E1, E2 or a radical chain reaction mechanism. To which mechanism(s), if any, does each statement apply? A. Involves a carbocation intermediate Mechanisms E1, S N 1 B. Rearrangements can occur during these reactions E1, S N 1 (radical chain reaction) C. When reaction occurs at a chiral center on a pure sample of a single enantiomer, a single enantiomer product with inversion of configuration is created. S N 2 E. Involves an antiperiplanar transition state geometry E2 F. The order of reactivity is 3 alkyl halides > 2 alkyl halides G. The order of reactivity is methyl halides > 1 alkyl halides > 2 alkylhalides and not 3 alkyl halides S N 1, E2, E1 S N 2 radical chain reaction H. For alkane starting materials, the order of reactivity is 3 hydrogens > 2 hydrogens > 1 hydrogens E2 I. The reaction that will occur when KOtBu is used J. The reaction that will occur when Br 2 and light are used radical chain reaction K. The reaction that will occur when HBr and peroxides with light are used radical chain reaction L. The reaction that will occur when NBS and light are used radical chain reaction M. Is promoted by polar protic solvents E1, S N 1 D. When reaction occurs at a chiral center on a pure sample of a single enantiomer, a mixture of product enantiomers will be created S N 1, radical chain reaction Signature_________________________ Pg 2 _____________(12) 3. (3 pts) For the following series of compounds,...
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This test prep was uploaded on 04/08/2008 for the course CH 310M taught by Professor Iverson during the Fall '05 term at University of Texas at Austin.

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Ex3Fl05Ans - Chemistry 310M/318M Dr. Brent Iverson 3rd...

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