Why does 4-bromonitrobenzene have a larger ? value than 2-bromonitrobenzene in silica gel TLC?
Why does 4-bromonitrobenzene have a larger ? value than 2-bromonitrobenzene in silica gel TLC? R
The TLC results of 2-Bromonitrobenzene and 4-Bromonitrobenzene shows that the para isomer travels farther up the plate and thus has a larger Rf value compared to the ortho isomer. Explain why the para isomer travels farther up the plate. Consider structure and polarity in your answer.
Which compound is likely to have the highest Rf value on silica gel TLC? Group of answer choices A) Benzoic Acid B) Dimethylaniline C) Benzophenone D) They will all have the same Rf value.
1. A mixture containing Compound X and Compound Y is analyzed using silica gel TLC. a. If Compound X has an Rf value of 0.7 and Compound Y has an Rvalue of 0.3, which compound is more polar? Explain. b. The solvent traveled 50 mm. How far did Compound Y travel? 2. Why isn't it reasonable for an R. value to be greater than 1? 3. How many spots would you expect to see if you conducted a TLC separation...
Arrange the following in order of expected Rr value on a silica gel TLC plate and provide your rationale. 2. Benzophenone 2-naphthol vanillin biphenyl
3) Consider the compounds trans-4-tert-butylcyclohexanol (1) and 4-tert-butylcyclohexanone (2) below. Using silica gel TLC plates, which of the two compounds will have the higher R value when dichloromethane is the developing solvent? Why? (5 pts).
9. Carboxylic acids often produce a streak rather than a spot when analyzed on silica gel TLC plates. Adding a drop or two of acetic acid to the eluant reduces streaking. Explain why carboxylic acids may streak on silica gel TLC plates and why adding acetic acid to the eluent reduces streaking. Amines also often streak on silica gel TLC. What might you add to the elu- ant to reduce such streaking? a. b.
4. Consider the following silica gel TLC plac or compounds A, B, and hexines: developed in Fo-o- og a) Determine the Rr values of compounds A, B, and C run on a silica gel TLC plate using hexanes as the solvent b) Which compound, A, B, or C. is the most polar? values if you used acetone instead c) What would you expect to happen to the of hexanes as the eluting solvent? 5) Consider a sample that is a...
6. Silica gel was used as the solid support for the TLC plate. Which of the three compounds (A, B, or C) in the APPLIED MIXTURE is the least polar? (See the figure attached.) 8. Which compound below will have the highest Rf on a TLC plate? Explain your reasoning. (See figure attached.) 10. The following TLC plates have been spotted with two different compounds and are about to be eluted. For each plate, explain if it has been spotted...
kindly answer the following thank you! 3. Since the surface of the silica gel on a silica gel TLC plate is covered in SI-O-H groups, organic molecules that can hydrogen bond will be much more attracted to the silica gel surface. Given that which of the following compounds would have the lowest Rf value if each of these was analyzed using a slica gel TLC plate and dichloromethane as a solvent? OH 4. Determine the Rf values for the two...
Expert Q&A Done TLC plate w silica gel in order of 1 cholesterol(standard) 2. Lecithin (standard) 3. Triglyceides (standard) 4. Egg(food sample) 5. Milk ( food sample) 1. Which lipids are in your food extracts? 2.Which lipids seems to be most abundant? Which is least abundant? 3.Do other lipids appear to be in food extracts besides the standards? 4. Explain the relative migration of the three standards from their structures and the relative polarities of the solvent mixture and the...