practice_exam_1 - _ Name CHM 3218 Spring 2008 Practice...

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__________________________________ Name Page 1 CHM 3218 Spring 2008 Practice Examination #1 University of Florida Honor Code Statement: "On my honor, I have neither given nor received unauthorized aid in doing this assignment." __________________________________ Student signature Instructions : You would have two hours in which to complete this exam. All books, notes and other aids would be prohibited, with the exception of molecular models and calculators. Be sure to budget your time and answer questions briefly but completely. To receive partial credit for incorrect answers, be sure to show your work, particularly in problems involving calculations. Write your name on each page. 1. Consider amino acid derivative 1 (FW 202 g/mole) and its hydrolysis products for the questions in this section. ( Total 20 points ). O O O O CH 3 CH 3 NH 2 H 2 N 1 a. Assign correct ( R ) / ( S ) designations to the asymmetric centers in structure 1 . ( 4 points ). b. Which of the compounds shown below in their Fischer projection forms ( 2 5 ) correspond to the enantiomer of the hydrolysis product of 1 ? Is the correct structure a D- or L-amino acid?. ( 4 points ). CO 2 H H 2 N H H CH 3 OH 3 CO 2 H H 2 N H CH 3 H OH 2 CO 2 H H NH 2 CH 3 H OH 4 CO 2 H H NH 2 H CH 3 OH 5 c. What is the name and one-letter code for the hydrolysis product of 1 ? ( 3 points ).
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__________________________________ Name Page 2 d. If 1 is added to water that is initially at neutral pH and the hydrolysis is allowed to proceed to completion in the absence of a buffer, will the final pH of the solution be acidic, neutral or basic? Show the relevant equilibrium (or equilibria) to support your answer. ( 4 points ). e. Consider the four graphs shown below (Curves A – D). Which of these corresponds to the titration behavior expected for the complete aqueous hydrolysis product of 1 ? Justify your answer, indicating the places on your chosen curve from which p K a values can be determined (and the approximate values). ( 5 points
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This note was uploaded on 05/21/2008 for the course BCH 3218 taught by Professor Johnsteward during the Spring '08 term at University of Florida.

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practice_exam_1 - _ Name CHM 3218 Spring 2008 Practice...

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