The TLC results of 2-Bromonitrobenzene and 4-Bromonitrobenzene shows that the para isomer travels farther up the...
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.
Homework Answers
Explantion:
The Rf value for a compound depends on partitioning of the solute between the mobile developing solvent and the stationary solid phase.Because of its symmetry in structure of para isomer ,it is less polar than ortho isomer and is less attracted to the solid phase and thus more soluble in mobile phase.consequently para isomer moves up plate more rapidly.
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The TLC results of 2-Bromonitrobenzene and 4-Bromonitrobenzene
shows that the para isomer travels farther up the...
Why does 4-bromonitrobenzene have a larger ? value than 2-bromonitrobenzene in silica gel TLC? R
Why does 4-bromonitrobenzene have a larger
? value than 2-bromonitrobenzene in silica gel TLC?
R
9. Based on looking at your TLC plate taken during step 2 of Dilantin synthesis, answer...
9. Based on looking at your TLC plate taken during step 2 of Dilantin synthesis, answer the following questions (a) Which is more polar, benzoin or benzil? Circle Below. Benzoin Benzil (b) Now look at the structures of benzoin and benzil. Specifically explain why one of these compounds has a lower Rr value than the other. You must address structure in your answer. Explain in one or two sentences (c) How can you tell by TLC if your reaction went...
3. If the TLC plate development had stopped before the solvent front reached the top of...
3. If the TLC plate development had stopped before the solvent front reached the top of the TLC plate (i.e. maybe it reached the middle of the TLC plate when it was stopped, instead): a) Would the Rf values have been affected? If so, how? If not, why not? Give a numerical example to support your answer. b) Would the size of the spots have been affected? If so, how? If not, why not? (Hint: think about the diffusion of...
I need help with my pre and post lab questions. The three compounds below were spotted...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached...
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached by the solvent the "solvent font a) Describe briefly, but precisely, what you would have done in order to get to this stage. You can assume that you have been given a suitable thin layer chromatography plate. b) Why is there a cover on the beaker? c) In order to help identify the things in a chromatogram, you can measure the Rf value for...
QUESTIONS HO — а Hab The 'H-NMR of the product shows two doublets in the aromatic...
QUESTIONS HO — а Hab The 'H-NMR of the product shows two doublets in the aromatic region (at ~7.8 ppm and 6.7 ppm with equal relative integration) H. and a very broad signal (the signal is almost flat from ~5.0 ppm to ~6.5 ppm and may actually extend into the doublet at ~ 6.7 ppm) which may indicate a "combination" of the amine and acid peaks. W h o o Hd The amine group can be considered to be electron...
i just need help with 2 & 3 & 4. please explain and help 8. Rf...
i just need help with 2 & 3 & 4. please explain and
help
8. Rf value of compound on a TLC plate: h. "Like dissolves like" 2. What does one achieve by doing Thin Layer Chromatography or a column chromatography on a mixture of organic compounds? o 3. What is the basis of separation of two or more organic compounds when they are subjected to TLC? ano 4. Unexpected result: Why do you think the elution sequence of the...
Two economists estimate the government expenditure multiplier and come up with different results. One estimates the...
Two economists estimate the government expenditure multiplier and come up with different results. One estimates the multiplier at 0.8, while the other comes up with an estimate of 1.25. Explain why these estimates are different in terms of the assumptions that each economist is making. A. Compared to the first economist, the second economist must be assuming either a smaller induced increase in consumption, a larger crowding out effect, or both. B. Compared to the first economist, the second economist...
Answer the following questions to complete your Results and Discussion section for this experiment. HBr HBr...
Answer the following questions to complete your Results and Discussion section for this experiment. HBr HBr A B Br Br 1 2 2. Does a more negative heat of formation (a larger negative number) mean that a compound formation? Draw an energy diagram that illustrates this. more stable or less stable than an isomer with a less negative heat of Drawing this on paper and uploading an image is recommended 3. There is a third bromobutene structure that could have...
I just need help understanding question 4 and how structure affects homo-lumo gap. Dye - 1B...
I just need help understanding question 4 and how
structure affects homo-lumo gap.
Dye - 1B 16 TT A T 28 2C Color Yollow Yellow ced Rod 476.35 Rod | 473.9 Rod | 461.77 Yollow 39.5 Amar (nm) 407.55 | 395.45 b. (0.5 points) How different are the colors of dyes 1A and 1B? (circle one) The same slightly different very different C. (0.5 points) How different are the colors of dyes 1A and 2A? (circle one) The same slightly...
Why does 4-bromonitrobenzene have a larger
? value than 2-bromonitrobenzene in silica gel TLC?
R
9. Based on looking at your TLC plate taken during step 2 of Dilantin synthesis, answer the following questions (a) Which is more polar, benzoin or benzil? Circle Below. Benzoin Benzil (b) Now look at the structures of benzoin and benzil. Specifically explain why one of these compounds has a lower Rr value than the other. You must address structure in your answer. Explain in one or two sentences (c) How can you tell by TLC if your reaction went...
I need help with my pre and post lab questions.
The three compounds below were spotted on a TLC plate and developed to give the TLC plate shown. Which compound corresponds to which spot? Calculate the Rf value for spot B in the TLC plate shown above. When using polarity to determine the relative rates at which organic compounds travel up the TLC plate, we are considering compounds of similar molecular weight. It should also be noted that Rf values...
2. The diagram below shows the results of a simple thin layer chromatography experiment. height reached by the solvent the "solvent font a) Describe briefly, but precisely, what you would have done in order to get to this stage. You can assume that you have been given a suitable thin layer chromatography plate. b) Why is there a cover on the beaker? c) In order to help identify the things in a chromatogram, you can measure the Rf value for...
QUESTIONS HO — а Hab The 'H-NMR of the product shows two doublets in the aromatic region (at ~7.8 ppm and 6.7 ppm with equal relative integration) H. and a very broad signal (the signal is almost flat from ~5.0 ppm to ~6.5 ppm and may actually extend into the doublet at ~ 6.7 ppm) which may indicate a "combination" of the amine and acid peaks. W h o o Hd The amine group can be considered to be electron...
i just need help with 2 & 3 & 4. please explain and
help
8. Rf value of compound on a TLC plate: h. "Like dissolves like" 2. What does one achieve by doing Thin Layer Chromatography or a column chromatography on a mixture of organic compounds? o 3. What is the basis of separation of two or more organic compounds when they are subjected to TLC? ano 4. Unexpected result: Why do you think the elution sequence of the...
Two economists estimate the government expenditure multiplier and come up with different results. One estimates the multiplier at 0.8, while the other comes up with an estimate of 1.25. Explain why these estimates are different in terms of the assumptions that each economist is making. A. Compared to the first economist, the second economist must be assuming either a smaller induced increase in consumption, a larger crowding out effect, or both. B. Compared to the first economist, the second economist...
Answer the following questions to complete your Results and Discussion section for this experiment. HBr HBr A B Br Br 1 2 2. Does a more negative heat of formation (a larger negative number) mean that a compound formation? Draw an energy diagram that illustrates this. more stable or less stable than an isomer with a less negative heat of Drawing this on paper and uploading an image is recommended 3. There is a third bromobutene structure that could have...
I just need help understanding question 4 and how
structure affects homo-lumo gap.
Dye - 1B 16 TT A T 28 2C Color Yollow Yellow ced Rod 476.35 Rod | 473.9 Rod | 461.77 Yollow 39.5 Amar (nm) 407.55 | 395.45 b. (0.5 points) How different are the colors of dyes 1A and 1B? (circle one) The same slightly different very different C. (0.5 points) How different are the colors of dyes 1A and 2A? (circle one) The same slightly...
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