Question is about a TLC analysis of spinach pigments Compound X is developed on a TLC plate using a 3:1 heptane:acetone eluent mixture. The same compound is then developed on a fresh TLC plate using a mixture of 1:3heptane:acetone eluent mixture. Select all the correct answers.A. Compound X will have a larger Rf value in the 1:3 heptane:acetone eluent mixture.B. Compound X will travel closer to the solvent front in the 1:3 heptane:acetone eluent mixture.C. Compound X will have the same Rf value in both eluent mixtures.D. Compound X will have a larger Rf value in the 3:1 heptane:acetone eluent mixture.

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Answered: Compound X is developed on a TLC plate…

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter89: Thin-layer Chromatography

Section: Chapter Questions

Problem 5P

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Similar questions

Consider 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!
Consider 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.
3. Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl The sample is spotted on a silica gel TLC plate and developed in hexane/ethyl acetate solvent mixture. Predict the relative Rf values for the three alcohol. compounds.
Consider 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 hexane. b) When a TLC plate was developed, the solvent front ran off the top of the 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?
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.
Compound X was developed on a TLC plate using a given eluent. The compound had a Rf value of 0.93 and the solvent front is 10.1 cm from the origin. Using this information, calculate the distance in cm that compound X traveled from the origin. Report your answer to one decimal place. cm
Every spot on a student's TLC plate has an Rf value from 0.1 to 0.2. The student used a 10% ethyl acetate 920%0% pentane mixture as the eluting solvent. What composition might yield better Rf values for separating the compounds? 100% pentane 5% ethyl acetate and 95% pentane 20% ethyl acetate and 80% pentane
True or False: Rf values can be used to identify pure compounds, provided that the analysis of the unknown is run simultaneously with the known compound in the same TLC plate.
if you wanted to makes the spots travel up the TLC plate further, what solvent ration would you choose and why? 1:2 Ethyl acetate/Hexane, 2:3 Ethyl acetate/ Hexane, or 1:1 Ethyl acetate/Hexane
1. Answer true or false for each statement: a) A TLC analysis is sufficient to characterize the purity of a compound. b) Carboxylic acids containing six or more carbon atoms per molecule are more soluble in2.5 M sodium hydroxide than in diethyl ether. c) Phenols containing six or more carbon atoms per molecule are more soluble in 2.5 M sodium hydroxidethan in diethyl ether. d) Benzoic acid and p-nitroaniline form water-soluble salts, whereas naphthalene does not. e) TLC analysis is the method of choice to determine the type of solid phase and eluent system that is required for a column chromatography separation. f) Mineral oil is an inappropriate heating fluid for determining the boiling points of samples that exceed 200°C (760 torr)? g) A heating bath containing mineral oil should not be used to determine the melting points of solids meltingabove 200 °C
Need help with a and b. A mixture of 1-hexanol, hexane, and 1-chlorohexane is injected on a gas chromatography column. a) Predict the sequence of retention times indicating which compound will have the shortest, middle, and longest retention time. b) The sample vial of (a) was not carefully sealed and left partially open for a couple hours. A GC is taken again with only two peaks realized. The first peak to appear has an area of 24 mm2 and the second peak 40 mm2. What mole% of each compound (specify the compound name) is most likely present?

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