Which of the following reaction sequences would convert 2- butanol into the deuterated compound below? CH;CH,CHCH3 он H;SO4 (1) BD3/THF A) heat (2) H202, NaOH Он H;SO4 D2/Pt B) heat он PBR3 (1) Mg, diethyl ether C) (2) D20 Он PBR3 N2OD, D20 D) A D B. C.
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- Which of the following reactions will synthesize phenol from benzene? 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) warm H2SO4 and H2O 1) HNO3 + H2SO4; 2) Fe, HCl; 3) NaNO2, HCl, 0-10 oC; 4) CuCN; 5) dilute acid and heat 1) Acetyl chloride & AlCl3; 2) bleach 1) Ph-N2+ + KI; 2) BrMgCH=CH2 in ether, followed by H3O+; 3) warm, conc'd KMnO4 1) Cl-CH(CH3)-CH2CH2CH3 + FeBr3; 2) hot, conc'd KMnO4(a) H3C OH (c) HBr Ether (e) CH3CH₂CHBrCH3 (f) CH3CH₂CH₂CH₂Br ? NBS hv, CCl4 Mg Ether Li Pentane (g) CH3CH₂CH₂CH₂Br + ? A? A? (CH3)2CuLi (b) CH3CH₂CH₂CH₂OH (d) H₂O CUI Ether B? B? ? OH PBr3 Ether SOCI₂ ?(a) 2-methyl-2-pentanol Draw the structure of the alkene that was used to prepare the alcohol in highest yield. ? ChemDoodle Which process does this employ? 1. Hg(OAc)2, H₂O; 2. NaBH4 1. BH3; 2. H₂O2, NaOH OsO4, H₂O2 √ [F
- n-Pentanol (CH3CH2CH2CH2CH2OH) and 2-methylbutan-2-ol (CH3CH2C(CH3)2OH) are converted to their corresponding alkyl chorides on being reacted with hydrogen chloride. (a) Write out an equation for each reaction (b) Assign each the appropriate symbol (SN1 or SN2) (c) Write a suitable mechanism for each reaction(b) Answer the following questions based on the compounds below. Jawab soalan berikut berdasarkan kepada sebatian di bawah. Br -Br A в (i) Which compound has the lower boiling point? Explain your answer. Sebatian manakah yang mempunyai takat didih yang lebih rendah? Terangkan jawapan anda. (ii) Draw the SN1 mechanism for the reaction of compound B with sodium hydroxide, NaOH. Lukiskan mekanisma SN1 bagi tindak balas antara sebatian B dengan natrium hidroksida, NaOH. (ii) Arrange the following compounds in increasing order of acidity. Susunkan sebatian berikut mengikut tertib menaik keasidannya. он HO, HO, EIQ3 نقطة واحدة Name the following heterocyclic ethers (a) إجابتك نقطة واحدة Name the following heterocyclic ethers H. CH,CH3 (d) CH,CH, H. إجابتك نقطة واحدة Name the following heterocyclic ethers -CH3 CH; () Br إجابتك. II >
- 4. identify the structure of A and B in the following synthetic scheme: Write out complete reactions for each step, showing the structure of all reactants and products. (a) cyclohexanol +Na2Cr2O7/H2SO4, H2O -------> A (b) A + Et2NH/H2SO4 ----->BThe reaction of 1-bromopropane and sodium hydroxide in ethanol occurs by an SN2mechanism. What happens to the rate of this reaction under the following conditions?(a) The concentration of NaOH is doubled.(b) The concentrations of both NaOH and 1-bromopropane are doubled.(c) The volume of the solution in which the reaction is carried out is doubled.For following substituted benzenes: [1] C6H5Br; [2] C6H5CN; [3] C6H5OCOCH3: Does the substituent activate or deactivate the benzene ring inelectrophilic aromatic substitution?
- 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.> acetone > ethane - Two molecular ions H3C-CH₂-CH₂-COR and have undergone McLafferty rearrangement and Ortho effect respectively. What are the possible fragments obtained as a result of these processes ? COOCH3 OH + -COH]: [CH₂O and Co] CO (A) (B) x] : [GH₂C (C) RH, C₂H₂ and CH₂CO: [(CH₂O), CO and CH₂OH] (D) H₂CCROH and C₂H4; [(CH₂O), CO and CH₂OH] R-CH₂-CH₂ - CH₂ - COH H₂C=CR = CROH and H₂C = CH₂ C₂H403 and CH4 P.T.O.Provide the structure of the product(s) with stereochemisty if appropriate. If multiple products indicate major product or if products are formed in equal amounts. If there is no reaction expected explain why. (a) OH HIO4 (the protecting group is remained) CHO H HOH2C OH (b) CHO -ОН NaCN # HO -H H -OH CH₂OH (c) CHO HO- -H HO -H NH₂OH 張一 H -OH H -OH CH₂OH i) Ba(OH)2 ii) MeOH, H₂SO4 NaOAc Ac₂0 NaOMe MeOH