Homework Answers
Solution:
A) Slightly polar
An eluent in TLC is the organic solvent having moderate polarity. It can not be highly polar because a highly polar eluent can dissolved stationary phase (silica and alumina).
B) Product
The rate of SN2 reaction decreases with increasing polarity of solvent, hence for SN2 reaction the polarity of starting materials must be lower.
Add Answer to:
more polar in a sn2 reaction
Describe the polarity of the TLC eluent. Non-polar Slightly polar...
Does TLC depend on solute particle size? I know that it depends on polarity i.e more polar solutes tend to not travel up...
Does TLC depend on solute particle size? I know that it depends on polarity i.e more polar solutes tend to not travel up the TLC plate as far as nonpolar solutes because the silica gel is polar, but does the particle size play any role in it? Also, what is meant by TLC having "pores" in it?
in 10:1 Hexane: 8: Use the image below to answer the following questions. The TLC plate was run gityl Acetate. (4 p...
in 10:1 Hexane: 8: Use the image below to answer the following questions. The TLC plate was run gityl Acetate. (4 points А.suong ial 8 -Starting Material and Reaction Product A) Calculate the Rf value for the starting material. (1 point) B) Calculate the Rf value for the product.(1 points) C) Is the product or the starting material more non-polar? (1 point) D) Is the reaction complete? (1 point) Question 9: Label the following peaks a-e on the H-NMR spectra...
Please help 2. Consider the TLC plate shown below that was done on silica gel using...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
A student monitored the reaction progress of the reduction of 4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC....
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
can you please answer all 1. When you run a TLC of the reaction in ethyl...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
By the TLC analysis, what can be learned about the reaction? (check all that apply) Question...
By the TLC analysis, what can be learned about the reaction? (check all that apply) Question options: Whether the product is more polar than the reactant Whether the reaction product is the desired product Whether any reactant(s) are remaining unreacted Whether the reaction was complete.
iz Instructions Question 9 Which of the following molecules will be non-polar? H20 CC14 No answer...
iz Instructions Question 9 Which of the following molecules will be non-polar? H20 CC14 No answer text provided. NF3
1) A student develops their TLC plate and places it under a UV light, but nothing...
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1) Which base yields the most SN2 when treated with the same starting material? (draw this...
1) Which base yields the most SN2 when treated with the same
starting material? (draw this structure with stereochemistry)
2)Which base would have the least yield of SN2?
3) What conclusions are made about the amount of SN2 product
formed as a function of base strength?
4) Discuss stereospecificity of an SN2 reaction and draw the
SN2 transition state intermediate formed when benzoate is treated
with starting material.
4. When the starting material shown below is treated with a variety...
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Help with synthesis of Lumino!!
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in 10:1 Hexane: 8: Use the image below to answer the following questions. The TLC plate was run gityl Acetate. (4 points А.suong ial 8 -Starting Material and Reaction Product A) Calculate the Rf value for the starting material. (1 point) B) Calculate the Rf value for the product.(1 points) C) Is the product or the starting material more non-polar? (1 point) D) Is the reaction complete? (1 point) Question 9: Label the following peaks a-e on the H-NMR spectra...
Please help
2. Consider the TLC plate shown below that was done on silica gel using a solvent mixture of 4:1 hexane/EtoAc as the eluent. 4:1 Hexane:EtOAC marked solvent front Spot B Spot A A origin (a) Which of the two organic compounds labeled A and B is less polar? (b) Calculate the Rf value of compound B. (c) How would the following changes affect the Rf values of A and B? i. Change to a more polar solvent mixture...
A student monitored the reaction progress of the reduction of
4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl
acetate in petroleum ether was used as the elution solvent. TLC
plates available in the laboratory were coated with the common
absorbent silica gel (SiO2.xH2O) which
contains polar hydroxyl (OH-) groups.
c. The crude product moves slower
than the starting material with the mobile
phase in the TLC plate. Briefly
explain a possible reason for the
observation based on the chemical
structures...
can
you please answer all
1. When you run a TLC of the reaction in ethyl acetate : hexanes 1:1, the plate below is produced. Give a solvent system that would be expected to produce greater separation and a BRIEF (8 words) justification about your choice. (5 points) 7 6 5 4 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most polar? (5 points) 2. Why is it...
iz Instructions Question 9 Which of the following molecules will be non-polar? H20 CC14 No answer text provided. NF3
1) Which base yields the most SN2 when treated with the same
starting material? (draw this structure with stereochemistry)
2)Which base would have the least yield of SN2?
3) What conclusions are made about the amount of SN2 product
formed as a function of base strength?
4) Discuss stereospecificity of an SN2 reaction and draw the
SN2 transition state intermediate formed when benzoate is treated
with starting material.
4. When the starting material shown below is treated with a variety...
Help with synthesis of Lumino!!
b. What is bioluminescence? How does it work? (Make sure you are specific with the structure of the compound and the name of the enzyme that creatures produce) Draw the full electron pushing mechanism for the synthesis of the starting material you use in this C. reaction, 3-nitrophthalhydrazide, from 3-nitrophthalic acid and hydrazine. HINT: this is an acyl substitution reaction between a carboxylic acid and amine functionality Chromatographic Features Comparisons: (5 points) 3. Predict the...
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