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- Which of the following compounds are suitable solvents for Grignard reactions?(a) n-hexane (b) CH3¬O¬CH3 (c) CHCl3(d) cyclohexane (e) benzene (f) CH3OCH2CH2OCH3Which of the following is an elimination reaction? ОН (A) CI (B) Br SH (C) CI (D) O A(ii) Identify the major products in the following reactions a) 200 °C 200 °C b) X + Y c) 180 °C
- Multiple choices A reaction shown below, which of the following could be the possible intermediate for it? OH (A) H₂O H+ ОА B C D (B) (D) OHIn each reaction below, give the reactants and state the intermediate products. (a) (b) (c) 흐 (e) - (CH OH - Br L 1 OH MgBr CN X-X-X OH H₂O 1 H(b) A compound with the molecular formula C4H9CI has four structural isomers. Write the structural formulas for all the four isomers. (c) Arrange the following compounds in order of increasing acidity, and explain the reasons for
- What is the major product of the following reaction HINT consoder if both Sn1 and Sn2 could take place? CI (a) CI CI OH ㅂ ② (b) OH H2O HO OH 4 (c) HO X CI (d) There will be no reactionDescribe the reaction to form the catalyst L-prolinamide. (reaction is added below) .Some of the most useful compounds for organic synthesisare Grignard reagents (general formula R-MgX, where X is ahalogen), which are made by combining an alkyl halide, R-X,with Mg. They are used to change the carbon skeleton of a start-ing carbonyl compound in a reaction similar to that with R-Li:.(a) What is the product, after a final step with water, of thereaction between ethanal and the Grignard reagent of bromo-benzene? (b) What is the product, after a final step with water, ofthe reaction between 2-butanone and the Grignard reagent of2-bromopropane? (c) There are often two (or more) combina-tions of Grignard reagent and carbonyl compound that will givethe same product. Choose another pair of reactants to give theproduct in (a). (d) What carbonyl compound must react with aGrignard reagent to yield a product with the -OH group at theendof the carbon chain? (e) What Grignard reagent and carbonylcompound would you use to prepare 2-methyl-2-butanol?
- (a) Explain how NaBH, in CH;OH can reduce hemiacetal A to 1,4-butanediol (HOCH,CH,CH,CH,OH). (b) What product is formed when A is treated with Ph;P=CHCH,CH(CH),? (c) The drug isotretinoin is formed by reaction of X and Y. What is the structure of isotretinoin? Although isotretinoin (trade name Accutane or Roaccutane) is used for the treatment of severe acne, it is dispensed under strict controls because it also causes birth defects. PPha NaOCH,CH3 HO- isotretinoin HO A Br X YTranslate the following reaction completely into English words using no symbols: 4NH3 + 5O2 --> 4NO + 6H2OWhich of the following reactions will be fastest? (a) Br: (c) Br: H S. CF3 (b) Br: (d) Br: CH3 OH