Which would elute first in thin layer chromatography, isatin (1H-indole-2,3-dione) or acetylbiphenyl quinoline carboxylic acid (2-biphenyl-4-yl-quinoline-4-carboxylic acid)? Explain why.
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Which would elute first in thin layer chromatography, isatin (1H-indole-2,3-dione) or acetylbiphenyl quinoline
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- 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?A thin-layer chromatography (TLC) experiement was run using three compunds: benzophenone, benzhydrol, and biphenyl. The three solvents that were used with the three compounds were hexane, ethyl acetate, and dichloromethane. Which solvent would be the best for separating these compounds and why?26. A mixture containing heptane, 2,2-dimethylbutane, hexanoic acid and heptanol was separated by gas/liquid chromatography. The stationary phase used was polar. In what order would the components leave the column? (A) (B) (D) Heptane, heptanol, hexanoic acid, 2,2-dimethylbutane Hexanoic acid, heptanol, heptane, 2,2-dimethylbutane 2, 2-dimethylbutane, heptane, heptanol, hexanoic acid Heptanol, 2, 2-dimethylbutane, hexanoic acid, heptane
- 6) You are given a mixture of organic compounds suspected of containing various amines (e. g. 4-chloroaniline). What is the best way to quickly separate these amines from the other organic compounds? a) Perform a fractional distillation on the mixture. b) Benchtop silica gel column chromatography. c) Dissolve the mixture in an organic solvent and treat the solution with aqueous HCI. d) Dissolve the mixture in an organic solvent and treat the solution with aqueous NaOH.1. Two of the substances used in this experiment, acetyl and 1,1l'-diacetylferrocene, contain the acetyl group. Draw an acetyl group and the compound acetyl chloride. What is the difference between an acetyl and acyl group? 2. During the chromatography the solvent may be changed from hexanes/ ethyl acetate (8:2) to hexanes/ ethyl acetate (4:6) depending on which ferrocenes are present in the mixture. (a) What is the reason for doing this? (b) Which of these solvent mixtures is more polar? (c) How would you prepare 200 mL of hexanes/ ethyl acetate (8:2)?Z and E -oct-3-en-2-ol is hard or easy to separate in thin layers in chromatography?
- Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spotswere detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of the answer onthe spots in the chromatogram shown at the picture.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?
- The analysis of ketones using the area normalization method gave the following data: 3-octanone (F= 1.00; peak area=22.0); 3- heptanone (F= 1.15; peak area= 17.5); 3- hexanone (F= 0.925; peak area= 9.5). What is the percent of 3-hexanone in the mixture? 71.2 % 39.5 % 17.2 % 43.3% 34.3 %The surface of the silica gel has a structure that looks like this diagram below. Suppose you used a plate coated with silica gel, with propanone, CH3COCH3, as the solvent for thin-layer chromatography. Sno Suppose also that the mixture you were trying to identify contained • benzaldehyde •benzanilide • phenol 1) rank the Rf Value from large to small 2) name the IMF between each compound and the silica gel OH OH main body of silica structureWhich of the following pairs of compounds would be most easily separated by thin layer chromatography: n-octyl alcohol and 1-octene, hexadecane and octadecane, or chlorobenzene and bromobenzene?
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