Qs4. This is a TLC analysis of 3 individual compounds. The plate was run in 20 % ethyl acetate, 80% hexane solvent mixture (eluent). Draw a schematic TLC plate for the same compounds, but when the eluent is 40% ethyl acetate, 60 % hexane. Indicate, what is the most polar and least polar compound (A, B, or C) -- A B C
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- A TLC plate was run in cyclohexane:ethyl acetate 4:1, the pure product, 2 starting materials and final product were spotted. what does the tlc tell you about the product.Which of the compounds would have the shortest retention time on a non-polar GC column? OH HO Hydroxymethyl- cyclohexanol MW: 114 bp: 183 2-Hydroxyethyl- cyclohexanol MW: 144 Methylcyclohexane Methylacetate MW: 98 bp: 101 mp: -127 d: 0.77 MW: 74 mp: -43 d: 0.93 bp: 270 mp: not available d: 0.98 bp: 57 mp: not available d: 0.98 Compound 4 Compound 2 Compound 3 Compound 1Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. The sample is spotted on a TLC plate and developed in a CH2C12-cyclohexane solvent mixture. Predict the relative Rf values for the three components in the sample. Would biphenyl be closest to the blotted line, then benzyl alcohol, then benzoic acid because these others are increasing in polarity to the non-polar solvent? Thanks!
- A student runs a TLC of a sample using a nonpolar development solvent. The TLC shows one spot. The MP of the same sample is 115.5 - 118.2 oC. What can we conclude from the experimental results. Group of answer choices The incorrect development solvent was used. The sample is pure. The sample is non polar. The sample is polar.A TLC is developed using a mixture of acetone/methanol (both polar solvents) as mobile phase. The solvent front runs 10 cm. Three spots A, B, and C are spotted with the following distances: А: 3.5 сm B: 8 cm C: 5 cm Which spot is the most polar? O A Ов O C O Both B and CPlease answer 1D. how would the Rf values change if eluted with hexanes using an alumina TLC plate? I think that an alumina plate is more polar than a silica plate, so I am inclined to say that this would increase the Rf values. But, I also know that hexanes are non-polar, so I am not sure if they would move up a very polar surface or not. Thanks!
- In this reaction, how do you determine the reaction is complete? он он + H,C CH, + H,C он он acetic anhydride acetic acid salicylic acid CH acetysalicylic acid Compare the reaction mixture vs. reactant on a polar TLC plate. The A disappearance of a spot with a higher Rf indicates the completion of the reaction. Compare the reaction mixture vs. reactant on a polar TLC plate. The B appearance of a spot with a lower Rf indicates the completion of the reaction. Compare the reaction mixture vs. the reactant on a polar TLC plate. Once the spot with a lower Rf value disappears, the reaction should come to an end. There are no difference in Rf value for the D compounds in this reaction. O=UConcentrated sulfuric acid, H2SO4, was used to visualize the sugars (cellobiose and glucose), whose identities were confirmed by TLC. Describe the mechanism by which the sulfuric acid, H2SO4, produces visible spots where sugars are present on the TLC plateA 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. To get the concentration of amine in this compound, you subject it to spectroscopic analysis. So, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample then you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. Solve for the molecular weight of the compound. The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.
- Arrange the following solvents in order of increasing polarity (least polar to most polar): Propyl Amine – Diethyl Ether – Ethyl Acetate- Octane If you ran an unknown sample on a TLC and observed only one spot with a Rf value of 0.95, is it safe to assume that it is a pure compound? If not, how can you check it out using TLC?Polarities of analyte functional group increase in the order of hydrocarbon < ethers < esters < ketones < aldehydes < amides < amines < alcohols Arrange the order of elution [from shortest to longest retention time] for the following six compounds from an HPLC C18 column. C2H5OH CH3COCH3 CH3COOH CH3COOC2H5 C2H50C2H5 (СН3)2NH O A. C2H5OH < CH3COOH < (CH3)2NH < CH3COCH3 < CH3COOC2H5Plant pigments in spinach were separated with TLC with cellulose as thestationary phase and 80/20 diethyl ether/acetone mixture as themobile phase. If needed, the solvent structures in the lab Appendix.1. Determine the Rf values of each plant component on this TLC plate.2. Arrange the plant components from most polar to most nonpolar. Please answer both 1 and 2 (picture below is the same question attached )SEE MORE QUESTIONS