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Please indicate the expected order of increasing polarity for the three compounds illustrated below and indicate...
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...
can u help me with 1,2,3? 1. (2 pts - 1 pt for correct traveling order,...
can u help me with 1,2,3?
1. (2 pts - 1 pt for correct traveling order, 1 pt for explanation) Based on the skeletal structures of biphenyl, benzhydrol and benzophenone, for a given TLC eluent, which of the three compounds would you expect to travel further on the TLC plate, and why? Copy your prediction into the Introduction section of your lab notebook. 2. (1 pt -0.5 pts per spot) Calculate the retention factor (R1) for each of the spots...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using silica gel plates. (2pts each) oso ooo a OH a) What would be a reasonable eluent that could be used to separate all three components on the TLC plate? Explain your reasoning. b) List the order of elution when using your proposed eluent. Explain your reasoning using complete sentences. c) What will be the effect on separation if you increase the polarity of your...
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The...
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The column is allowed to elute into many containers, usually test tubes. This is followed by a TLC on a long plate containing the same stationary phase as the column chromatography. Since a large number of tubes must be spotted, by spotting only every other (or every three etc.) tube on the plate. After visualization (by UV), the TLC plate is used to judge which...
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and...
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and 1,4-dimethoxybenzene). Assume you spot a plate with three standard solutions, each containing one of the components. Sketch what you expect the developed TLC plate to look like and identify which compound is which spot. 5. Draw a picture of the test tube with the prepared solution of the model compound and the prepared buffer and the beam of the UV spectrometer beam passing through...
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...
Arrange the following compounds in order of increasing base strength (least basic to most basic) Indicate...
Arrange the following compounds in order of increasing base strength (least basic to most basic) Indicate the relationship between each pair of molecules Choose from configurational stereoisomers, conformers. constitutional isomers, or different formula
Macros III. Physical Properties 10 pts 10. Place the compounds below in order of increasing melting...
Macros III. Physical Properties 10 pts 10. Place the compounds below in order of increasing melting point. Briefly explain your reasoning VELHO d) e) f) f) 11. Place the same compounds in order of increasing polarity. Briefly explain your reasoning 12. Dichloromethane (methylene chloride CH2C12) is which of the following: i. Water immiscible and more dense than water il Water miscible and more dense than water ili. Water miscible and less dense than water iv. Water immiscible and less dense...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
1. (6 pts.) Rank the following compounds in order of increasing acidity. Each series should be co...
Please solve and explain
1. (6 pts.) Rank the following compounds in order of increasing acidity. Each series should be considered separately. Use resonance and/or inductive effects to explain acidity. For full credit you will need to draw any resonance forms or indicate dipole if it is relevant. Also for each compound draw its conjugate base. Series 1: OH он OH O Series 2: CN 2. (4 pts.) Fill the reactions with the products and circle the favorite side: OH+...
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...
can u help me with 1,2,3?
1. (2 pts - 1 pt for correct traveling order, 1 pt for explanation) Based on the skeletal structures of biphenyl, benzhydrol and benzophenone, for a given TLC eluent, which of the three compounds would you expect to travel further on the TLC plate, and why? Copy your prediction into the Introduction section of your lab notebook. 2. (1 pt -0.5 pts per spot) Calculate the retention factor (R1) for each of the spots...
10. Consider the separation of the mixture of the compounds shown below using TLC analysis using silica gel plates. (2pts each) oso ooo a OH a) What would be a reasonable eluent that could be used to separate all three components on the TLC plate? Explain your reasoning. b) List the order of elution when using your proposed eluent. Explain your reasoning using complete sentences. c) What will be the effect on separation if you increase the polarity of your...
8.5 TLC is commonly employed with column chromatography to monitor the separation of colorless compounds. The column is allowed to elute into many containers, usually test tubes. This is followed by a TLC on a long plate containing the same stationary phase as the column chromatography. Since a large number of tubes must be spotted, by spotting only every other (or every three etc.) tube on the plate. After visualization (by UV), the TLC plate is used to judge which...
4. Predict the TLC behavior to be expected from the three Anacin components (aspirin, caffeine, and 1,4-dimethoxybenzene). Assume you spot a plate with three standard solutions, each containing one of the components. Sketch what you expect the developed TLC plate to look like and identify which compound is which spot. 5. Draw a picture of the test tube with the prepared solution of the model compound and the prepared buffer and the beam of the UV spectrometer beam passing through...
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...
Arrange the following compounds in order of increasing base strength (least basic to most basic) Indicate the relationship between each pair of molecules Choose from configurational stereoisomers, conformers. constitutional isomers, or different formula
Macros III. Physical Properties 10 pts 10. Place the compounds below in order of increasing melting point. Briefly explain your reasoning VELHO d) e) f) f) 11. Place the same compounds in order of increasing polarity. Briefly explain your reasoning 12. Dichloromethane (methylene chloride CH2C12) is which of the following: i. Water immiscible and more dense than water il Water miscible and more dense than water ili. Water miscible and less dense than water iv. Water immiscible and less dense...
1. A TLC experiment is performed to separate a mixture of the compounds shown below. 5.2 cm 4.8 cm • C 0-H O-H 2.3 cm • B OCH3 Phenol Cyclohexadiene m-anisic acid 1.1 cm • A a) Draw dipole arrows / dipole moments present for each molecule (if they have any) (2 points) b) The experiment yielded the TLC plate given on the left. Match each spot to one of the three molecules. For each compound, explain what makes it...
Please solve and explain
1. (6 pts.) Rank the following compounds in order of increasing acidity. Each series should be considered separately. Use resonance and/or inductive effects to explain acidity. For full credit you will need to draw any resonance forms or indicate dipole if it is relevant. Also for each compound draw its conjugate base. Series 1: OH он OH O Series 2: CN 2. (4 pts.) Fill the reactions with the products and circle the favorite side: OH+...
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