(a)
Interpretation:
In the given chromatography experiment, the structure of the decomposition product needs to be determined.
Concept Introduction:
Chromatography is recognized as physical method to separate, identify and purify the components of mixtures.
Gas-chromatography −The method to separate gaseous or volatile substances by utilizing gas as mobile phase is known as gas chromatography. There are two types of chromatography
- Gas liquid chromatography
- Gas solid chromatography
The gas chromatography is utilized to separate the mixture's components and analysis.
(b)
Interpretation:
The reason for increase in the amount of the decomposition due to increase in temperature needs to be explained.
Concept Introduction:
Chromatography is recognized as physical method to separate, identify and purify the components of mixtures.
Gas-chromatography − The method to separate gaseous or volatile substances by utilizing gas as mobile phase is known as gas chromatography. There are two types of chromatography
- Gas liquid chromatography
- Gas solid chromatography
The gas chromatography is utilized to separate the mixture's components and analysis.
(c)
Interpretation:
The reason for easy decomposition of tert-butyl chloride as compared to tert-butyl bromide needs to be explained.
Concept Introduction:
Chromatography is recognized as physical method to separate, identify and purify the components of mixtures.
Gas-chromatography − The method to separate gaseous or volatile substances by utilizing gas as mobile phase is known as gas chromatography. There are two types of chromatography
- Gas liquid chromatography
- Gas solid chromatography
The gas chromatography is utilized to separate the mixture's components and analysis.
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Chapter 20 Solutions
EBK A SMALL SCALE APPROACH TO ORGANIC L
- 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/garrow_forwardA student rushed through this experiment. Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Briefly explain the basis of each answer.(a) Rather than adding 0.5-mL portions of boiling solvent to the acetanilide, the student added 5-mL portions of boiling solvent.(b) The student did not pre-heat the gravity filtration apparatus.(c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room-temperature solvent.arrow_forward1. Which is a false statement regarding solid-phase synthesis? (a) It simplifies removal of solvents (b) It simplifies automation of reactions (c) It simplifies monitoring of reactions (d) It simplifies reproducibility of reactions (e) It simplifies removal of soluble reagents 2. Which is a main advantage of solid-phase synthesis? (a) It simplifies purification of products (b) It can be performed on a large scale (c) It simplifies monitoring of reactions (d) It requires less amount of reagents (e) It simplifies characterisation of intermediatesarrow_forward
- Gas Chromatography (GC) is one of the useful techniques in analytical chemistry. Give two important components in GC.arrow_forwardWhat 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?arrow_forward(a) What is the molarity of the NaOH? (b) Based on the propagation-of-error formula, what is the standard devlation of the molarity?arrow_forward
- Upon screening with TLC (made of silica gel) chromatography using hexane/chloroform (3:1) as eluting solution, 3 spots were detected corresponding to a (A) polyphenol, a (B) tannin and an (C) alkaloid. Write the letters of the on the spots in the chromatogram shown at the right.arrow_forwardUse a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.arrow_forward2. Consider the following example GC Chromatogram from a publication about aggression among Mediterranean Acrobat Ants (C. scutellaris). This particular sample was generated by rinsing hydrocarbons from ant exoskeletons. From the chromatogram, what is the minimum number of unique compunds present in the sample? What data led you to that conclusion? (Don't overthink it) 2 8000000 7000000 6000000 5000000 4000000 3000000 2000000 1000000 Counts (Abundance) 5 19 6 7 0 23.00 24.00 10 | 11 13 17 20 14 15 16 12 teel | 22 19 21 ли 25.00 26.00 27.00 Time "Example of a Gas chromatography-Mass spectrography (GS-MS) chromatogram of hydrocarbon molecules in C. scutellaris" by Filippo Frizzi, et.al, in PLoS One is licensed under CC BY 4.0arrow_forward
- During an assay of paracetamol by UV an analyst prepares a series of calibration solutions containing approximately 3-15 mcg/mL paracetamol as follows: 140.1 mg of pure paracetamol was added to a 200 mL volumetric flask. 0.1 M NaOH (50 mL) was added, the mixture well shaken and made up to volume with deionized water 10 mL of the above solution was diluted to 100 mL 1)What is the concentration of the final diluted solution in mcg/mL?(1 decimal) 2) What volume of the diluted solution is required to prepare 100 mL of a 8 mcg/mL standard solution? (1 decimal)arrow_forward12.8 A student is following a reaction (the conversion of compound A to Com- pound B) by TLC. Aliquots of the reaction mixture are taken and analyzed at time = 0, 10, 20, and 30 min. The TLC plate, developed in 90% hexanes-10% ethyl acetate, is shown below. (a) Which is the more polar compound, A or B? (b) Is the reaction complete at 10 min? 20 min? 30 min? (c) How can the identity of Compound B be verified by TLC? Compound A origin 0 10 20 30 Compound Barrow_forwardConsider 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?arrow_forward
- EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT