Worksheet 3 - Chemistry 231-1 Fall 2007 Optional Worksheet...

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Chemistry 231-1 Fall 2007: Optional Worksheet 3 Name: ______________________________________ 1) (2 pts) How many transition states are present in the reaction in the energy diagram? o 0 o 1 o 2 o 3 o 4 2) (2 pts) Which of the following reactions can be classified as a substitution reaction? (Ignore the reagents used; just compare the structures of the starting material and products.) o A o B o C o A and B o A, B, and C 3) (2 pts) Consider the following reaction. Assuming no other changes, what would happen to the rate of the reaction if the concentrations of both the alkyl halide and the OH - were doubled? o No effect o The rate would double. o The rate would triple. o The rate would increase 4-fold. o The rate would increase 6-fold. 4) (2 pts) Given the following substitution reaction, what would the effect be of changing the solvent from
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Unformatted text preview: CH 3 OH to (CH 3 ) 2 S=O? o The rate would increase. o The rate would decrease. o The potential change cannot be predicted. 5) (2 pts) Which of the following alkyl halides reacts fastest in an S N 1 reaction? o A o B o C o D o E 6) (2 pts) Which of the following anions is the most nucleophilic? o A o B o C 7) (4 pts) Write a complete reaction equation that shows how you might prepare the following molecules using a nucleophilic substitution reaction. CH 3 CH 2 CH 2 CN Br NaCN DMSO CN CH 3-O-C(CH 3 ) 3 CH 3 Br KO O 8) (4 pts) Propose a reasonable stepwise mechanism for the following transformation using curved arrows to show the movement of electrons. Clearly show all nonzero formal charges. Br CH 3 OH OCH 3 HBr Br CH 3 OH OCH 3 H Br Br OCH 3 HBr...
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