Is ether a good solvent for TLC? What would be expected to be seen on a TLC plate if 2,6-dimethylaniline was spotted on lane 1 and 2,6-dimethylnitrobenzene on lane 2 and developed in ether?
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Is ether a good solvent for TLC? What would be expected to be seen on a TLC plate if 2,6-dimethylaniline was spotted on lane 1 and 2,6-dimethylnitrobenzene on lane 2 and developed in ether?
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- Chemistry 1)Arrange the following in order of increasing Rf in TLC? 3-pentanone, 3-pentanol,pentane.2) If all your Rfs were too large, what would you do to your solvent system to bring themdown?• What solvent(s) would you try next?3) What would happen if you spotted too much compound on your TLC plate?4) One of the compounds we are examining today has a chiral center.• Which one has a chiral center?• Identify it.Both melting points and TLC rely on differences in non covalent forces. Explain the role of these non-covalent interactions in the final answer obtained (melting point and Rf value).would hexene be a good eluent in a TLC experiment separating hex-1-ene and hexanol?
- 7. A student gets the following results after running a TLC plate of several over the counter analgesics. What should the student do to get better results? O Run the TLC for a longer time. O Co-spot the sample several times. Run a new TLC plate in a less polar solvent. O Run a new TLC in a more polar solvent mixture.What is a good TLC stain that can differentiate ethyl cinnamate and ethyl hydrocinnamate? What is a good TLC stain to identify dehydroabietylamine on a TLC plate?1. Which compound will have the largest Rf value on a TLC plate using 10% ethyl acetate/hexane as a developing solvent: 3- decanone or 3- decanol, toluene or benzoic acid, cyclohexane or cyclooctanone? Explain why?
- 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/gConsider the following errors that could be made when running TLC. Indicate what should be done to correct the error.a. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent used was acetone.b. A two-component mixture containing a dicarboxylic acid and tricarboxylic acid gave only one spot with an Rf value of 0.05. The solvent used was hexane.c. When a TLC plate was developed, the solvent front ran off the top of the plate.
- WILL HEXANE DISSOLVE fenethylline IN GC-MS?b. Answer the questions about the compounds below. جو عید بھید A OH B i) Which compound would have the highest Rf value by TLC? ii) Which compound would have the lowest Rf value by TLC? iii) Which compound would elute first in column chromatography? iv) Which compound would elute last in column chromatography?Consider a TLC plate loaded with the following compounds: Phenyl acetate, glycine, butyric acid, and cyclohexanol a) which spots would you expect to show up under the uv lamp b) suggest the best indicator to use for each compound c) which indicator would you use to visualize all the compounds at once