Chem 140B Midterm 1

Chem 140B Midterm 1 - Name:_ ID:_ 1 CHEMISTRY 140B 01/27/09...

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Name: ____________________________ ID: _____________________ 1 ANSWER KEY CHEMISTRY 140B 01/27/09 1st Midterm Exam AVERAGE: 105/150 corresponds to lowest B( -) STANDARD DEVIATION: 25 points Instructions: 1: This exam consists of 8 pages , including this page. ( Page #8 is blank). At the beginning of the examination period, put your name at the top of each page. 2. This exam accounts for 25% of the final grade (150 points total). 3. You can use the backside of each page, or page #8, as a scratch paper. However your final answers must be clearly written within the designated box that follows after each question. At the end cross out all unused space . 4. You may use pen or pencil. However exams completed with pencil will not be regraded. 5. The grades will be announced on Thursday 01/29/09. If you wish to have your exams regraded, you may submit them to me before 02/03/09. After 02/07/09 all grades are final. 6. The exams will be available from my secretary's office at 5224B during 10:00am -5:00 pm everyday. 7. Read carefully the instructions for each problem. 8. Keep your eyes in your own exam!!! GOOD LUCK Problem Points Score 1. 30 ________ 2. 30 ________ 3. 30 ________ 4. 30 ________ 5. 30 ________ TOTAL 150 _______
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Name: ____________________________ ID: _____________________ 2 Problem 1 a. Compounds 1 and 2 have all MF: C 6 H 12 BrCl. For each compound indicate: 1. expected number of peaks (families) in the 1 HNMR. 2. expected splitting pattern for each peak. CH 3 Cl H 3 C Br CH 3 CH 3 Cl H 3 C CH 3 Br 1 2 1 H NMR peaks: splitting patterns: 3.8 1.0 2.2 1.9 2 1 3 6 1 H NMR peaks: splitting patterns: b. One of the above compounds has the following 1H NMR. Which compound is it? c. Based on the above NMR spectrum, predict how the 1 H NMR should be for the other compound. Show clearly the integration ratios , splitting patterns and be as precise as you can with the ppm values for each peak. 0 2
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This note was uploaded on 03/21/2009 for the course CHEM 140B taught by Professor Nefzi during the Winter '06 term at UCSD.

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Chem 140B Midterm 1 - Name:_ ID:_ 1 CHEMISTRY 140B 01/27/09...

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