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- (b) Give the products for the following chemical reactions. HO SOCI, CHO NACN (H) (D HCNFollowing are the steps in the industrial synthesis of glycerin. Provide structures for all intermediate compounds (AD) and describe the type of mechanism by which each is formed.(d) When butane, CHSCH:CH:CHsand bromine gas, Brz is exposed to sunlight, monobrominated product are produced. The reaction equation is glven below: Apabila butana, CH:CH2CH2CH3 dan gas bromin, Brz terdedah kepada cahaya matahari, produk pembrominan tunggal dihasilkan. Persamaan tindak balas diberikan di bawah: UV CH;CH,CH,CH, - Bry B.
- (a) Draw the structures ofA to E in the following reactions. он 1. LIAIH, 2. H0 PCC 00 Lindiar's catalyst OH (CH,COOH THOCHICH,lla (*DET 1. RCOH 2. HO(b) Calculate the pH of 0.0005 mol dm3 ethanoic acid when its pKa = 4.75 CH3COOH( CH3COO() + H™ Ka = pH =(ii) Identify the major products in the following reactions a) 200 °C 200 °C b) X + Y c) 180 °C
- 4. Protonation of alcohol A and subsequent loss of water, produces the intermediate B. CH3 CH; CH, CH, — с — сH, CH, CH;CH, - C- CH, CH; | OH A B (a) (i) Name alcohol A. (11) What type of species is intermediate B? (iii) Draw the structures of the two alkenes which can be formed from species B by removal of a proton. Label as C the alkene which shows geometrical isomerism. (b) The intermediate B is readily attacked by nucleophiles such as water. What is the essential feature of a nucleophile? (c) State what final colour you would see if alcohol A were warmed with acidified potassium dichromate(VI). Explain your answer. Colour Explanation . (ii) Draw two structural isomers of alcohol A which form branched chain ketones when heated with acidified potassium dichromate(VI), but which could not form alkene C on dehydration.(a) (b) HO N N-H Catalytic H+ (-H₂O) ? (c) NH2 HO N (d)(a) Compound D undergoes a reaction with hydrogen bromide, HBr to produce 2-bromobutane. D exists as cis-trans isomers and decolourises bromine solution in methylene chloride, CH2CI2. Sebatian D mengalami tindak balas dengan hidrogen bromida, HBr untuk menghasilkan 2-bromobutana. D wujud sebagai isomer cis-trans dan memudarkan larutan bromin dalam metilena klorida, CH2CI2. (i) Draw and name the structure of compound D. Lukis dan namakan struktur sebatian D. (ii) Draw two (2) constitutional isomers of compound D. Lukis dua (2) isomer berjuzuk bagi sebatian D.
- (k) (1) Me. an allene CH₂ CO₂Me Ph N₂ a. TsN 3, DBU b. Rh₂(OAC)4 CO₂Me Rh₂(OAC)4Identify (A) in the following reaction. 2H2 Pt (A) KMNO4 Warm conc. || С — С — о—н |CO,H + HO CO2H cis-cyclo hexane 1,2-dicarboxylic acid (a) (b) (c) (d)Provide the major product for the following reaction? (1) Mg, ether (2) CO2. (3) H3O* Br