Homework Answers
1. Vaniline is 3-methoxy-4-hydroxy benzaldehyde (1) and toluidine (2) may taken p-methyl aniline and imine (3) is the formation product from both.
2. Polarity of 1 is highest and 2 will be lowest and 3 in between, therefore retained in mobile phase 1 will be lowest migration, and 2 will go up highest.
therefore order will be
Polarity:
Vaniline > imine > Toluidine
and
visualised spot:
(Lowest) Vaniline > (middle) imine > (Highest) Toluidine
Therefore correct answer will be D
Reacrion mix will be in middle and vaniline spot lowest and toluidine will go highest.
Add Answer to:
Please explain why.
Which TLC plate can you anticipate for the imine formation step? (V Vanillin,...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
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) 9 10 8 7 LLLLLLL 6 5 4 001 2 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most...
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...
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...
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...
6. Silica gel was used as the solid support for the TLC plate. Which of the...
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...
What is the theorectical yeild for step 1 and step 3? - Step 1 has 0.76g...
What is the theorectical yeild for step 1 and step 3?
- Step 1 has 0.76g of ortho-vanillin and 0.535g of
para-toludine.
-step 3 has 2ml of glacial acetic acid and 2ml of acetic
anhydride. it gets warms and 75ml of water is added
Step 1: Synthesis of 2-methoxy-6-(p-tolyliminomethyl)-phenol: Imine formation Weigh a 250 mL beaker and then add 0.76 grams (5 mmol) of ortho-vanillin to one side of the beaker. Record the total mass of the beaker plus the...
Chm 250 please help ASAP Thank you and it's in exam Below is a TLC plate...
Chm 250 please help ASAP
Thank you and it's in exam
Below is a TLC plate in which silica gel is the stationary phase. (1) What does "TLC" stand for? (2) For samples 1 through 5 which one contains the compound of largest polarity? Explain your answer. (3) Based on the TLC result, what are the components of mixture M?
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates with spots on them....
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates
with spots on them. could somone PLEASE PLEASE PLEASE help me get
their measurmentS (in milimeters) and help me calculate their Rf
values!!! I promise to rate u good if you could help!!! Im so
confused!!! THANK U SM
-solvent front scluent front Acetaminophen (A Afine (caf) Unknown mixture Phenacetin (Phn) Salicyamide (sal) Plate 2 Untuan unknown ixture mixture duplicate spots Plate 1 ASSIGNMENT In this experiment, TLC...
why is the mel di Using the TLC slide drawn below, calculate the Rr values for...
why
is the mel
di Using the TLC slide drawn below, calculate the Rr values for each spot. See page /o in the lab manual for help. b. State which of the three known substances are present in the unknown by comparing the Unknown Rr values to the Rx values for the Known substances. See page 76 in the lab manual for help. You will need a metric ruler. Solvent front- Origin of spot lu 1 2 3 U =...
Possible Quiz Questions 1 What two methods of visualizing spots on a TLC plate will you use in this Give two reasons why would you predict that the elution solvents (hexanes or acetate) would not be visible under UV visualization? week's lab? ethyl 2. Define R 3. Calculate the R of the spot on the following TLC plate. 4. Which compound in each pair is predicted to have the higher Ri? a. CH3CH2CH2CH2OH and CH3CH2CH2CH28r b. CH3CH2CH2CH2OH and CH3CH2CH2CH2CH2CH2CH3 c....
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) 9 10 8 7 LLLLLLL 6 5 4 001 2 3 b. Calculate the R for the bottom spot. (5 points) c. Which compound on the TLC plate is the most...
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...
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...
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...
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...
What is the theorectical yeild for step 1 and step 3?
- Step 1 has 0.76g of ortho-vanillin and 0.535g of
para-toludine.
-step 3 has 2ml of glacial acetic acid and 2ml of acetic
anhydride. it gets warms and 75ml of water is added
Step 1: Synthesis of 2-methoxy-6-(p-tolyliminomethyl)-phenol: Imine formation Weigh a 250 mL beaker and then add 0.76 grams (5 mmol) of ortho-vanillin to one side of the beaker. Record the total mass of the beaker plus the...
Chm 250 please help ASAP
Thank you and it's in exam
Below is a TLC plate in which silica gel is the stationary phase. (1) What does "TLC" stand for? (2) For samples 1 through 5 which one contains the compound of largest polarity? Explain your answer. (3) Based on the TLC result, what are the components of mixture M?
CAN SOMONE PLEASE HELP. above is a picture of two TLC plates
with spots on them. could somone PLEASE PLEASE PLEASE help me get
their measurmentS (in milimeters) and help me calculate their Rf
values!!! I promise to rate u good if you could help!!! Im so
confused!!! THANK U SM
-solvent front scluent front Acetaminophen (A Afine (caf) Unknown mixture Phenacetin (Phn) Salicyamide (sal) Plate 2 Untuan unknown ixture mixture duplicate spots Plate 1 ASSIGNMENT In this experiment, TLC...
why
is the mel
di Using the TLC slide drawn below, calculate the Rr values for each spot. See page /o in the lab manual for help. b. State which of the three known substances are present in the unknown by comparing the Unknown Rr values to the Rx values for the Known substances. See page 76 in the lab manual for help. You will need a metric ruler. Solvent front- Origin of spot lu 1 2 3 U =...
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