课程名称︰有机化学一 课程性质︰化学系大二必修 课程教师︰罗礼强 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰2020/12/3 考试时限（分钟）：110min 试题 : 1. Please provide structures of the following groups: (a) methylene (b) vinyl (c) halohydrin (d) bromonium (e) methanide 2. Describe the following terms: (a) Zaitsev’s rule (b) Markovnikov’s rule 3. Provide a reasonable mechanism for each of the following reaction. https://i.imgur.com/lSOwUWL.jpg 4. What is the smallest trans cycloalkane that is stable at room temperature? Gi ve its name and draw its structure. 5. Provide a mechanism to account for the following transformation. https://i.imgur.com/LeWGNOi.jpg 6. Predict the more stable alkene of each pair: (a) 2-methyl-2-pentene or 2,3-dimethyl-2-butene (b) cis-3-hexene or trans-3-hexene. Please briefly describe how you could experimentally determine their relative st ability. 7. What product(s) would you expect from the following solvolysis? Provide a mec hanism to explain your answers. https://i.imgur.com/H0ebgld.jpg 8. Rank the following in terms of decreasing nucleophilicity; (a) CH3OH (b) CH3CO2- (c) CH3O- 9. Rank the following alkyl bromides in order of decreasing reactivity as a subs trate in an SN2 reaction. https://i.imgur.com/p8KSSbH.jpg 10. Which reaction in the following pairs would you expect to give better yield of the desired product? Explain your answers. https://i.imgur.com/tNYsS7t.jpg 11. Please compare the difference between basicity and nucleophilicity. 12. Would you expect the following reaction to occur faster in DMF or in EtOH? E xplain your answers. CH3CH2CH2Br+NaCN —> CH3CH2CH2CN+NaBr 13. Write a three-dimensional formula for the product formed when 1-methylcycloh exene is treated with each of the following reagents. In each case, designate th e location of deuterium or tritium atoms. (a) I) BD3, THF II)CH3CO2H (b) I) BH3, THF II)CH3CO2T 14. (a) When cis-1-bromo-2-methylcyclohexane undergoes an E2 reaction, two products( cyclohexenes) are formed. What are those two cyclohexenes, and which would you e xpect to be the major product? Write conformational structures showing how each is formed. (b) When trans-1-bromo-2-methylcyclohexane reacts in an E2 reaction, only one cy clohexenes is formed. What is this product? Write conformational structures show ing why it is the only product. 15. What major product(s) would you expect from each of the following reactions? https://i.imgur.com/auhPGgC.jpg 16. Provide proper conditions for the following transformations. In each case mo re than one reaction is required and you may use any other needed reagents. https://i.imgur.com/oFthBVJ.jpg 17. Compound A has the molecular formula C10H16 and is known not to contain any triple bonds. When treated with excess hy drogen and a platinum catalyst, compound A is converted to 2,6-dimethyloctane. Ozonolysis of compound A followed by treatment with Me2S yie lds 2 mol of HCHO, 1 mol of CH3COCH3, and a third compound B with the formula C5 H6O3. Please deduce the structures of compound A and B, and explain your answers . -- 愿使岁月静好，现世安稳。 --

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