1) A mixture of benzoic acid, para-xylene and benzaldehyde is spotted on a silica gel TLC plate and developed using Ethyl Acetate with 0.5% acetic acid as the solvent. Predict the relative Rf values for the three components in the sample (highest to lowest). 2) Arrange the following solvents in order of increasing polarity (least polar to most polar): Diethyl Ether, Propyl Amine, 3-Methyl-Pentane, Acetone
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- 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.The purpose of this experiment is to use both extraction and crystallization techniques to separate a solid mixture of organic compounds. You will receive a packet with 1 g of a unknown (pH is basic) amide solid sample which will contain three components, one from each group: Group 1 (~50% wt): ethyl 4-aminobenzoate, ortho-toluic acid, or benzoic acid Group 2 (~40% wt): fluorene, 1,4-dibromobenzene, benzil, benzoin Group 3 (~10% wt): fluorene, 1,4-dibromobenzene, benzil, benzoin (but not the same as Group 2 compound) Create a lab procedure that will allow you to successfully isolate, purify, and identify the two major (Group 1 and Group 2) components of the unknown amide sample. reagents that can be used are 1M HCl, 6M HCl, 1M NaOH, 6M NaOH, diethyl ether, and methylene chlorideGiven a mixture of benzoic acid, 2-naphthol and p-dimethoxybenzene in t-butyl methyl ether. Using the following reagents: NaHCOs, NAOH and HCI. Draw a flow chart showing: a) How to separate the three components of this mixture? b) Identify the aqueous and organic layers in each step. c) Identify the number of extraction step.
- 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?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 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?
- 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 %Topic: Iodoform Test for Alcohol and Phenol Explain/Discuss the expected results for Ethanol, Butanol, 2-Propanol, 2-methyl-2-propanol, and Phenol to Iodoform Test.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
- Why is distillation of cyclohexanol using acid catalyst phosphoric acid a better technique to purofy rather than extraction, recrystallization, chromatography, IR spectroscopy?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 CPease indicate the compound that best fits in the blank of the separation scheme below. OH H2N Benzoic Acid Biphenyl Benzocaine Phenol benzocaine phenol biphenyl benzoic acid dissolve in ether; extract with aqueous 19)_ ether aq 20) CO:(g) H2O HIDDEN COMPOUND 1 HIDDEN COMPOUND 2 HIDDEN COMPOUND 3 trace 21) |6.0M М НСI aq NaCl 22). HO Which of the following is the best choice for blank 21 in the given separation scheme? O H2SO4 O pentane O HCI NaHCO3 O H20