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Assignment_5_2011_Answers - CHM 1321 Assignment#5 ANSWERS 1...

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CHM 1321 Assignment #5 - ANSWERS 1. Use arrow notation to show the mechanisms of the following reactions. Use your mechanism to predict the product of the reaction. Identify the nucleophile, its nucleophilic atom, the α carbon of the electrophile and the leaving group. Note: You can write the salt in the product either as NaCl (for example) or Na + , Cl -
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Assignment 5 Answers 2
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Assignment 5 Answers 3 2. A solution of 0.25 M cyclohexylbromide and 0.36 M CH 3 NH 2 is created. Measurements show that the reaction produces 3.6 X 10 -7 mol L -1 of product each second. a) Calculate the rate constant for the reaction. b) If the concentration of CH 3 NH 2 is changed to 0.15 M, what is the initial rate of the reaction?
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Assignment 5 Answers 4 c) Predict the relative rate (faster or slower) of the reaction if CH 3 CH 2 CH 2 OH is used in place of CH 3 NH 2 and justify your choice. The reaction will be slower. Oxygen is more electronegative than nitrogen and is therefore less able to donate electrons. The oxygen-based nucleophile is therefore not as good as the nitrogen- based one and the reaction will therefore be slower.
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