On performing a tlc of the reaction product of borohydride reduction on a plate alongside pure benzophenone, a student observed two spots in their product, the stronger corresponding to the benzophenone. What conclusion can be drawn?
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(a) On performing a tlc of the reaction product of borohydride reduction on a plate alongside pure benzophenone, a student observed two spots in their product, the stronger corresponding to the benzophenone. What conclusion can be drawn?
(b) What is the stationary phase on the tlc plate and why is it effective as a stationary phase?
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- On performing a tlc of the reaction product on a plate alongside pure benzophenone, a student observed two spots in their product, the stronger corresponding to the benzophenone. What conclusion can be drawn? What is the stationary phase on the tlc plate and why is it effective as a stationary phase?Why mixture of solvents such as ethyl acetate with 5% acetic acid is used as a solvent/mobile phase for developing TLC? Please explain in detail.Comparing the structures of benzyl acrylate and the dihydroxylated product, what would you expect to observe monitoring the reaction by TLC, and why?
- Q1: Give one lysis buffer that is commonly used for western blotting experiments and include its components Q3: To make sure that you used a similar amount of samples, what important step should be done before proceeding the electrophoresis stage? Q4. Why is it necessary to store the prepared lysates in a very low temperature?When naphthalene, butyric acid, and phenyl acetate are separated using dichloromethane as the developing solvent on a silica gel TLC plate, which compound would have the highest Rf value? Which would have the lowest?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.
- 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?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.For Fluorenonce and benzoic acid 1. Which compound would you expect to be the top spot on the TLC and why? 2. Which compound would you expect to be the first to come off the column and why? 3. What data supports the identification of the compound in a yellow fraction?
- What is chelating agent? What is the chelating agent being coupled to sepharose in this experiment? Please suggest one more chelating agent that can be used in Immobilized Metal Ion Affinity Chromatography.This is an illustration of TLC plates. The compounds used were syn-azobenzene (A) and anti-azobenzene (B). The difference between the two plates are that the first was placed in 15% methylene chloride in pet. ether and the second was placed in 30% methylene chloride in pet. ether. I calculated Rf values to be 0.47 mm for syn-azobenzene and 0.44 mm for anti-azobenzene in 15% while syn-azobenze had a Rf of 0.28 mm and 0.16 mm. Which solvent is best at separating and how does Rf help identify which isomer is which? I read that the anti is supposed to have a higher Rf but that is not the case here so I want to know if the syn is supposed to have the higher Rf and the anti is supposed to have the lower one.Explain the function of using dichloromethane after the steam extraction of Eugenol. Also discuss if there are any differences and which ones in soxhlet extraction and steam drag.