Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification. Concept introduction: Transesterification is a process in which the alcohol group present in the carboxylate of triglyceride is exchanged by another organic alcohol group. This can occur in presence of either acid or base as catalyst. The general scheme can be shown as, Please remember that transesterification using basic condition is done in few steps rather than acidic conditions. In presence of excess base the transesterification does not happen instead hydrolysis occurs. To draw : the mechanism for the given transformation.

Question

(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

Answer 1

Question

Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 26.4, Problem 14LTS

(a)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept introduction:

Transesterification is a process in which the alcohol group present in the carboxylate of triglyceride is exchanged by another organic alcohol group. This can occur in presence of either acid or base as catalyst. The general scheme can be shown as,

Please remember that transesterification using basic condition is done in few steps rather than acidic conditions.

In presence of excess base the transesterification does not happen instead hydrolysis occurs.

To draw: the mechanism for the given transformation.

(b)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept Introduction:

Hydrolysis is a process in which the ester is converted to its respective carboxylic acid and alcohol in presence of aqueous acid or base. In case of triglyceride the hydrolysis results in formation of glycerol and three fatty acid units. In presence of other organic alcohol unit this hydrolysis occurs if the base is present in large amount rather than transesterification.

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(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

fcrip = ↓ bandwidth Il temp 32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual components of the van Deemter equation and consequently, band broadening? Increase temperature Longer column Using a gas mobile phase instead of liquid Smaller particle stationary phase Multiple Paths Diffusion Mass Transfer

34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10

Answer 2

Question

Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 26.4, Problem 14LTS

(a)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept introduction:

Transesterification is a process in which the alcohol group present in the carboxylate of triglyceride is exchanged by another organic alcohol group. This can occur in presence of either acid or base as catalyst. The general scheme can be shown as,

Please remember that transesterification using basic condition is done in few steps rather than acidic conditions.

In presence of excess base the transesterification does not happen instead hydrolysis occurs.

To draw: the mechanism for the given transformation.

(b)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept Introduction:

Hydrolysis is a process in which the ester is converted to its respective carboxylic acid and alcohol in presence of aqueous acid or base. In case of triglyceride the hydrolysis results in formation of glycerol and three fatty acid units. In presence of other organic alcohol unit this hydrolysis occurs if the base is present in large amount rather than transesterification.

Expert Solution & Answer

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Answer 3

Question

Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 26.4, Problem 14LTS

(a)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept introduction:

Transesterification is a process in which the alcohol group present in the carboxylate of triglyceride is exchanged by another organic alcohol group. This can occur in presence of either acid or base as catalyst. The general scheme can be shown as,

Please remember that transesterification using basic condition is done in few steps rather than acidic conditions.

In presence of excess base the transesterification does not happen instead hydrolysis occurs.

To draw: the mechanism for the given transformation.

(b)

Interpretation Introduction

Interpretation:

Mechanism for the given transformation need to be drawn and if sodium hydroxide is present in large amount for transesterification.

Concept Introduction:

Hydrolysis is a process in which the ester is converted to its respective carboxylic acid and alcohol in presence of aqueous acid or base. In case of triglyceride the hydrolysis results in formation of glycerol and three fatty acid units. In presence of other organic alcohol unit this hydrolysis occurs if the base is present in large amount rather than transesterification.

Expert Solution & Answer

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See solution

Check out sample textbook solution

Answer 4

Question

Definition Definition Class of organic compounds that contain a carboxyl group ( - COOH ) and has a general formula R - COOH or R - CO 2 H , where R refers to the alkyl, alkenyl, aryl, or other groups. They can undergo different chemical reactions, such as acid-base reactions, esterification, and oxidation. These are essential components of living organisms, playing important roles in metabolic processes, signaling, and as pharmaceuticals.

Chapter 26.4, Problem 14LTS

(a)

Interpretation Introduction