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Exam 2 2005S

Exam 2 2005S - CHM 235 Prof Robinson Name Exam#2 Summer...

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CHM 235 Exam #2 Summer 2005 Prof. Robinson Name ID# Instructions: Answer any 10 of the following 11 questions. An 11 th question may be answered for extra credit (also worth 10 points) 1. Name the five functional groups highlighted in the following compounds (2 pts each): 2. (a) Show the products that will be formed in the acid base reaction between CH 3 COOH (acetic acid) and Na + F - . (2 points) CH 3 COOH + Na + F - (b) Will products or reactants be favored at equilibrium if the pK a of CH 3 COOH is 4.76 and the pK A of HF is 3.45? ______________ (2 points) (c) What products will be formed in the following Lewis acid/base reactions? Show all lone pairs and include all non-zero formal charge in the products (3 pts each). 1 CH 2 OH CH 3 C O H N CH 3 CH 3 CH 3 + B F F F + CH 3 O CH 3 Al C Cl Cl CH 2 NH 2 HOCCH 2 O
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3. (a) Using Newman projections, draw the three staggered conformations of 2- methylbutane, looking down the C2-C3 bond. (5 points) (b) Indicate how many gauche interactions there are in each conformation (3 pts) (c) Circle
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