Consider the chlorination (Cl2, hν) of optically active (2R,3R)-2-chloro-3-methylpentane. If the dichloro fraction is analyzed by gas liquid phase chromatography (GLPC), how many peaks may be seen? How many of the compounds in the dichloro fraction show optical activity?
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Consider the chlorination (Cl2, hν) of optically active (2R,3R)-2-chloro-3-methylpentane. If the dichloro fraction is analyzed by gas liquid phase chromatography (GLPC), how many peaks may be seen? How many of the compounds in the dichloro fraction show optical activity?
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- 5. Consider the chlorination (C2, hv) of optically active (2R,3R)-2-chloro-3-methylpentane. If the dichloro fraction is analyzed by gas liquid phase chromatography (GLPC), how many peaks may be seen? How many of the compounds in the dichloro fraction show optical activity?1,8-Cineole is a predominant terpene found in cranberries. The concentration of 1,8-cineole in cranberries was determined using gas chromatography. A 5.00 g sample of freeze-dried cranberry powder was added to 10.0 mL water to form a cranberry extract. The extract was filtered. A 1.00 mL aliquot was added to a 25 ml volumetric along with a known amount of internal standard (d-14 cymene) and diluted to volume with water. Standards were spiked with a fixed amount of d-14 cymene as internal standard. The following data was obtained: 1,8-Cineole (ug/mL); 1,8-Cineole (peak area); d-14 cymene (peak area) 10.0; 1260; 1880 15.0; 1865; 1850 20.0; 2520; 1855 50.0; 6280; 1865 Sample; 1976; 1840 What is the concentration of 1,8-cineole in ug per gram of cranberry? O 398 ug/g O 159 ug/g O 674 ug/g O 796 ug/g O 15.9 ug/gWhy is distillation of cyclohexanol using acid catalyst phosphoric acid a better technique to purofy rather than extraction, recrystallization, chromatography, IR spectroscopy?
- Use a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.You are an aquatic scientist and tasked to sample water that contains chlorophenols for gas chromatographic analysis from your local waste water treatment plant (WWTP). Using knowledge of sample preparation and chromatograph, how would you sample, preserve and prepare these samples for GC analysis and why GC is the best detection technique?3. To determine ethanol content in beer using Gas Chromatography (GC) - Flame Ionization Detection (FID), which of the following is the suitable internal standard? (A) Acetone (B) n-propanol (C) Propane (D) Water
- A thin-layer chromatography (TLC) experiment was run using three compounds: benzophenone, benzhydrol, and biphenyl. The three solvents that were used with these compounds were hexane, ethyl acetate, and dichloromethane. Which solvent would be the best for separating these compounds and why?6. A certain mixture contains the following compounds: propionic acid, 2-hexanol, isoamyl acetate, and 3,4-dimethylheptane. Rank the compounds in the order of decreasing rate of elution using normal phase liquid chromatography. Explain your answer.Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of your answers on the spots in the chromatogram shown at the right.
- What is the function of the sulfuric acid in the dehydration of alcohols to form alkenes? Why was it important to keep the Gas chromatograph close to room temperature during the analysis of the alkene mixture?Identify these statements with true or false true or false I. Chromatography utilizes partition coefficient theory true or false II. In reverse phase chromatography, the mobile phase is a polar solvent true or false I. Aspirin is an ester prodrug. true or false Aspirin is synthesized by means of an acid catalyzed reaction. true or false I. Grain alcohol boils at 78.3 C true or false Wood alcohol boils at 60 C true or false Diazo coupling involves a sigma and a pi bond in two nitrogen atoms true or false When methyl orange passes through from basic to acidic medium, the change in color is from yellow to intense red true or false Benzoic acid is a white crystalline substance that has a melting point of 122 C true or false Benzoic acid can be prepared by the alkaline reduction of toluene true or false Potassium permanganate is an oxidizing agent true or false Potassium permanganate should never be mixed with glycerin true or false Methyl…2) A mixture of phenol, bromobenzene, and toluene is injected on a gas chromatography column. Predict the sequence of retention times indicating which compound will have the shortest, middle, and longest retention time.