8. show electron flow). Suggest a detailed step-by-step reaction mechanism for the reactions shown in a-b (use arrows to CH3 FOH H;C, (a) H,SO4 CH3 HO- CH3 CH3 -CH-I CH;OH CH3 (b) + HI OCH3
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Needing help on parts A and B
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- 1. How would you prepare the following alkyl halides from the appropriate alcohols? (a) ÇI (b) Br CH3 CH3CH3 CH;CHCH,CHCH3 ČH3 2. Predict the products of the following reaction: (a) он CH3 (b) H2C CH;CH,CHCH,CHCH, Per, socl2. PBr3 ? H3C5. Consider the synthesis of 2-butanone from butyne: Hg2+ CH3CH,-C=C–H CH3CH, Ĉ -CH3 H3o* (i) Draw the structure of the compound D. (ii) Compound D isomerizes to form 2-butanone. What is this isomeric process called? (iii) Use the mechanism to show the conversion of compound D to 2-butanone.a) Provide a mechanism that accounts for the product formed in the following reaction. OH CH H" ► 1-ethoxy-1-methyleyclohexane + CH,CH,OH b) Show the structure of the product(s) formed in the following reaction and write the mechanism for the reaction. OH CH + (CH;);COH
- For each pair of ions, determine which ion is more stable. Use resonance forms to explain your answers. (a) CH;-CH-CH, or CH,-CH-OCH, (b) CH;-N-CH, CH3-CH-CH; or CH;-C-CH; CH;-C-CH, (c) CH=CH-ČH-CH, or CH,=CH-CH;-CH2 (d) CH-CH, or CH,-C N: (e) CH2 CH2 () or orPredict the products of the following acid-base reactions. If the equilibrium would not result in the formation of appreciable amounts of products, you should so indicate. In each case label the stronger acid, the stronger base, the weaker acid, and the weaker base: (a) CH3CH=CH2 + NANH2 (d) CH3C=C: + CH;CH2OH → (e) CH3C=C:- + NH¾CI – | (b) CH;C=CH + NaNH2 (c) CH3CH2CH3 + NANH2 → | HAS(b) Predict the suitable solvent (H2O or CH3COCH3) to increase the reaction of bromopropane (CH3CH2CH2B1) with sodium hydroxide (NaOH). Two reactions are shown below: NaOH, 55 °C CH;CH,CH,Br CH;CH,CH,OH + NaBr H,O (i) NaOH, 55 °C CH;CH,CH,Br CH;CH,CH,OH NaBr H,C CH (ii)
- (a) (b) HO N N-H Catalytic H+ (-H₂O) ? (c) NH2 HO N (d)10. Compound X (C4H9Br) reacts by heating with NaOH in H2O to form Y. The compound Y then undergoes acid catalysed hydration by H2SO, in 180°C to form 2-methyl prop-1-ene. (e) Determine the structure of X and Y. (f) Predict a MAJOR product when compound Y reacts with H2SO4 in 140 C. (g) Draw a structural isomer of X. Name the isomer using IUPAC nomenclature. (h) Describe a chemical test to distinguish between compound Y and 1-butanol.(a) Answer the following questions based on the reaction scheme below. Jawab soalan berikut berdasarkan rajah tindak balas di bawah. H,SO, 180°C R OH+ Δ U NH, (i) State reagent Q. Nyatakan reagen Q. (ii) Draw the structural formula for compounds R, T, U and W. Lukiskan formula struktur bagi sebatian R, T, U dan W. PCI,
- (c)Show step by step how to synthesize methoxybenzene from benzene.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) Tsomane and Nyiko were given a task of synthesising methylenecyclohexane 2. After a brief discussion with each other, Tsomane proposed Method A to synthesise 2 from cyclohexanone 1 while Nyiko proposed Method B that started from hydroxymethylcyclohexane 3. Each student believed that their proposed method is better than the other. (Scheme below) Ph THF A Ph Ph B H₂SO4 100 °C 3 OH (iii) In analysing both these methods, are there other possible alkene products other than methylenecyclohexane 2? Use mechanistic details to support your answer.