1. Which statement below correctly describes the reaction shown? Br Br Br CH3 CH

Question

1. Which statement below correctly describes the reaction shown? Br Br Br CH3 CH3 NaCN CH3OH SN2 reaction a. A is fastest, B is slowest b. B is fastest, C is slowest c. C is fastest, A is slowest d. Since the are all primary bromides, they all occur at the same rate e. None of the above 2. What change would you expect on the rate of the reaction of ethanol with 2-iodo-2 methylbutane if the nucleophile concentration is doubled and the alkyl halide concentration is divided by 4? a. divided by 4 b. halved c, no change d. increased 2X 3. Identify the HoMo and the LUMo that participate in the following reaction. (nb non-bonding) CN CH3Br CH3CN Br a. HOMO nb orbital on CN LUMO o orbital on CH3Br LUMO orbital on CH3Br b. HOMO orbital on CN c. HOMO orbital on CH3Br d. HOMO> nb orbital on CH3Br LUMO orbital on CN e. HOMO orbital on CNN LUMO o orbital on CH3Br

Explanation / Answer

1) substitution nucleophilic bimolecular (SN2) reaction occurs via a backward attack of the nucleophile, as a result of which less crowded the molecule from the rear side, more easily the reaction becomes. In this context, the reaction will be fastest for A and slowest for B (teartiary alkyl bromide is more crowded)

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