Test_2008_Section_B_Answers_3

Test_2008_Section_B_Answers_3 - CHM 2120 Test ANSWERS...

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CHM 2120 Test±–± ANSWERS September 23, 2008 First Name: _____________________ Last Name: _______________________ Student Number: ______________________ Section: A (MRN Aud): ___________ B (UCU Aud): ___________ Approximate total number of marks: 81 Note: the marks are given as a guide and are subject to change
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Test – ANSWERS 2 1. Draw the following molecules as full Lewis structures and name them. (6 points) a. NaOAc 2 pts: structure 1 pt: name O C O C H H H sodium acetate Na or O C O C H H H Na b. CH 3 CH(Br)CH 2 COOH 2 pts: structure 1 pt: name HC H H C H Br C H H C O O H 2. a. Draw the important resonance forms using arrows to show the movement of electrons. (4 points) b. Rank the resonance structures. (2 points) c. Justify your ranking. (5 points) CH O CH O CH O Intermediate Minor Major - all atoms have octets - One charge - Negative charge on C, the less electronegative atom The C + lacks an octet - All atoms have full octets - 1 charge - Negative charge on more electronegative atom 1 point 1 point Structure: 1 point Structure: 1 point Extra, wrong structures (pentavalent carbon, etc): -1 1 1 1 1 1 Ranking: 2 points
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Test – ANSWERS 3 3. a. Draw the mechanism and products for the following reaction. (5 points) b. Will the reaction favour starting materials or products?
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This note was uploaded on 01/25/2011 for the course MAT 1330 taught by Professor Dumitriscu during the Spring '08 term at University of Ottawa.

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Test_2008_Section_B_Answers_3 - CHM 2120 Test ANSWERS...

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