A group of researchers are tasked to synthesize pure (R)-butan-2-ol. Suggest the suitable pair of starting material and reagent O a. (R)-2-chlorobutane + H2O O b. (S)-2-chlorobutane + NaOH O c. (R)-2-chlorobutane + KOH O d. (S)-2-chlorobutane + CH3OH
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- In the beginning of this video https://www.youtube.com/watch?v=9Ng6Zv9oLzk, what reason is given on why the dienophile likes the diene?In the reaction below, 3-Buten-2-one reacts with 2,3-Dimethyl-1,3-butadieneand 1,3-Butadieneat 140°C and 30°C, respectively. Explain why these two dienes react at different temperatures.A mixture of 0.10 mol benzene and 0.10 mol p-xylene was allowed to react with 0.10 mol nitronium ion until all the nitronium ion was gone. Two products were obtained: 0.002 mol of one and 0.098 mol of the other. a. What was the major product? b. Why was more of one product obtained than of the other?
- Which of the following is product of A? How about B? a Cyclopentene oxide b 1,1-epoxycyclopentane c 1,2-hydroxycyclopentane d Cyclopentoxypentane What is the name of reaction 1? a hydration b hydrate formation c acid cleavage d epoxidation What is the name of reaction 2? a ring-opening reaction with Nu b hydration c Williamson ether synthesis d oxidation(a) Illustrate the following name reactions giving suitable example in each case :(i) Clemmensen reduction (ii) Hell-Volhard-Zelinsky reaction(b) How are the following conversions carried out?(i) Ethylcyanide to ethanoic acid (ii) Butan-l-ol to butanoic acid(iii) Benzoic acid to m-bromobenzoic acidFor butenafine, develop a synthesis that starts with napthalene and benzene. (aromatic methyl groups can be converted to alkyl bromides using Br2/light, and aldehydes by heating the alkyl bromide in DMSO, eg. ArCH3 to ArCH2Br then to ArCHO).
- Which of the following is correctly related? a.Limonene: unsaturated aliphatic b.Limonene: aromatic c. Cyclopentane: aromatic d. 1-Butene: saturated aliphatic 2. EXCEPT for one 2,3-dimethylheptane and 2,3-dimethylhepta-1,5-diene, the following tests or reagents could distinguish them.a. Under gloomy conditions, Br2 in waterb. Alkylation Friedel-Crafts Testc. Combustion1. What is the function of CH2Cl2 in the bromination reactions? Why can it fulfill this role?2. In not more than three (3) sentences, explain why terminal alkynes are acidic.3. What impurities are removed when acetylene gas is made to pass through an acidified solution of CuSO4?4. Explain the difference in the rate of free-radical bromination reactions of toluene and cyclohexane.5. Give the reagent or chemical test that would differentiate the following pairs o fcompounds. Provide only the reagents or chemical tests discussed in the module. Write chemical equations for the reactions involved. a. benzene and ethylbenzeneb. 1-butyne and 2-butynec. 2-methylpentane and 2-methyl-2-pentened. toluene and 1-methylcyclohexeneExplain the following result. Although alkenes are generally more reactive than alkynes towards electrophiles, the reaction of Cl2 with but-2-yne can be stopped after one equivalent of Cl2 has been added.
- (S)-2-Butanol, instead of (R)-2-butanol, is obtained from the reaction between (R)-2-bromobutane with hydroxide ion. What kind of reaction is this (SN1,SN2,E1 OR E2) ? Explain briefly this inversion of configuration (i.e. (R) configuration for the reactant and (S) configuration for the product) and What is this inversion called?Organotin compounds play a significant role in diverse industrial applications. They have been used as plastic stabilizers and as pesticides or fungicides. One method used to prepare simple tetraalkylstannanes is the controlled direct reaction of liquid tin(IV) chloride with highly reactive trialkylaluminum compounds, such as liquid triethylaluminum (Al(CzHs)3). 3SnCl4 + 4Al(C2H5)3 → 3Sn(C2H5)4 + 4AlCl3 In one experiment, 0.160 L of SnCl4 (d= 2.226 g/mL) was treated with 0.346 L of triethylaluminum (Al(C2H5)3); d = 0.835 g/mL). What is the theoretical yield in this experiment (mass of tetraethylstannane, Sn(C2H5)4)? If 0.257L of tetraethylstannane (d= 1.187 g/mL) were actually isolated in this experiment, what was the percent yield?Suggest a possible reason for the following observations: (i) The order of reactivity of haloalkanes is RI > RCl > RBr. (ii) Neopentyl chloride (CH3)3CCH2Cl does not follow SN2 mechanism. (iii) Ethers have low boiling points.