OH "Н HOH a) 28,45 b) 2R, 4R c) 2S,4R d) 2,45 13. Which is the correct assignment of chirality at C2 and C3 of the follo

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OH "Н HOH a) 28,45 b) 2R, 4R c) 2S,4R d) 2,45 13. Which is the correct assignment of chirality at C2 and C3 of the following molecule? CHO H HO OH PH CH2OH a) 2S,3S b) 2R,3R c) 2S,3R d) 2R,35 14. Which of the following statements regarding the SN2 mechanism is wrong? a) SN2 reactions are bimolecular. b) SN2 reactions are usually second order. c) The SN2 mechanism occurs in one step. d) SN2 reactions usually occur in two steps. 15. Which of the following statements regarding the SNI mechanism is wrong? a) SNI reactions are unimolecular. b) SNI reactions are first order. e) The SNI mechanism involves a single step.

19. Which of the following is most reactive as a nucleophile? a) Pho- b) Phs. c) PhCH20- d) PhCH2NH2 20. Which is the least reactive compound by the SN2 mechanism? Br Br Br Br d) 21. Which of the following statements regarding the E1 mechanism is wrong? a) Reactions by the El mechanism are unimolecular in the rate-determining step. b) Reactions by the El mechanism are generally first order. c) Reactions by the El mechanism usually occur in one step. d) Reactions by the El mechanism are multi-step reactions. 22. Which of the following statements regarding the E2 mechanism is wrong? a) Reactions by the E2 mechanism are always bimolecular. b) Reactions by the E2 mechanism are generally second order. c) Reactions by the E2 mechanism usually occur in one step. 18