Cis-3-hexene and trans-3-hexene can be separated and analyzed using GC without injecting an equimolar standard to a high accuracy. Explain why that is the case for these two compounds while we had to inject an equimolar solution for our experiment
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- Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.Cis-3-hexene and trans-3-hexene can be separated using GC. Explain why these two compounds can be separated by GC and not by fractional distillation.SEE PHOTO: Effectiveness of separation. Based on the TLC analysis, did the isolated benzoic acidappear pure relative to the starting mixture? Did the isolated naphthalene look pure?How could the purity of the isolated materials be improved? In the picture: Aq- is Benzoic acid O- is Naphthalene both- is both Benzoic acid and Naphthalene
- We want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which of the following solvents is not suitable for this purpose? Why? Propanone (acetone), dichloromethane, heptane.What is the function of the sulfuric acid in the dehydration of alcohols to form alkenes? Why was it important to keep the Gas chromatograph close to room temperature during the analysis of the alkene mixture?A mixture contains the following compounds: 2-chloropentane, pentanoic acid, cyclopentane and pentanal. Arrange the following compounds in INCREASING Rf if the mixture underwent paper chromatography with the same solvent system used in the experiment.
- Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed. (a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering. (b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM. (c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. - B (d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3. (e) You neutralised the NaHCO3 solution to pH7 rather than pH2.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?2. Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed. (a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering. (b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM. (c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. (d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3. (e) You neutralised the NaHCO3 solution to pH7 rather than pH2.
- The literature value for the melting range of a pure compound is 113-115o C. What is the expected experimental melting range of that recrystallized compound immediately after being isolated from the Buchner funnel before drying completely? Explain.Why was n-octanol chosen as a surrogate for natural organic phases? Why notanother solvent such as n-hexane, methylbenzene, trichloromethane, or diethylether?Why is the use of any organic solvent as general surrogate of a natural organicphase somewhat questionable?Why is distillation of cyclohexanol using acid catalyst phosphoric acid a better technique to purofy rather than extraction, recrystallization, chromatography, IR spectroscopy?