The predominant form of glucose in solution is a ring structure represented by the Haworth projection....
The predominant form of glucose in solution is a ring structure represented by the Haworth projection. Why then does glucose give a positive test and react completely in reactions which are characteristic of its straight chain form?
Homework Answers
In the ring structure, glucose stays in hemiacetal form. In open chain form, glucose has an aldehyde functional group. The ring structure is formed when the aldehyde functional group condenses with one of the alcohol functional groups. The ring structures of glucose always stays in equilibrium with the open chain structure in solution. Hence, glucose gives a positive test (e.g. positive Tollens' test) and react completely in reactions which are characteristic of aldehyde functional group.
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The predominant form of glucose in solution is a ring structure
represented by the Haworth projection....
Glucose generally exists in ring (cyclic) form. A Haworth projection shows the orientations of the hydroxyl...
Glucose generally exists in ring (cyclic) form. A Haworth projection shows the orientations of the hydroxyl groups and hydrogen atoms on the ring. Draw the alpha and beta forms of glucose by moving the groups (H, OH, or CH2OH) to the appropriate positions.
Draw the Haworth Projection for the compound represented by this model. also need help answering these...
Draw the Haworth Projection for the compound represented by
this model.
also need help answering these questions that go along with
the model i included
Model 5 (This model does not rotate) Н H CH,OH С C НО НО C Н C с. H ОН) ОН Н (b) Haworth projection formulas of cyclic monosaccharides. View model #5 of the cyclic monosaccharide and answer the following: • Is the ring structure a pyranose (6 sides) or a furanose (5 sides): •...
Glucopyranase can be draw as a Haworth projection but also in chair or boat conformation. Which...
Glucopyranase can be draw as a Haworth projection but also in chair or boat conformation. Which form of glucopyranose predominates? Why? Draw the predominant structure below.
This question is referring to a glucose ring structure How does ring closure affect structural variability?...
This question is referring to a glucose ring structure How does ring closure affect structural variability? That is, can the ring form of glucose have as many different structural shapes as the chain form of glucose? Is this 6-member glucose ring actually flat (planar)? Why/why not? Where is the carbonyl group in the glucose ring? Can you convert the ring to the chain without breaking bonds? How many carboxyl groups are in this molecule? How many dissociable groups? Could you...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives a positive Benedict's test; make sure to circle the part of the structure that is responsible for the reaction with Benedict's reagent. [5pts) Haworth Projection: (2.5 points) Hemiacetal circled / indicated (2.5 points) CARBOHYDRATES POST-LAB QUESTIONS CONT'D 24. When Benedict's reagent reacts with a reducing sugar, it oxidizes the aldehyde functional group to a carboxylic acid. As seen in the figure below: only a...
13) Consider the ring structure of B-D-glucose. It will give a positive test as a reducing...
13) Consider the ring structure of B-D-glucose. It will give a positive test as a reducing sugar. Describe how can that happen?
D-glucose is shown below in its straight-chain and ring forms. A) Put an asterisk next to...
D-glucose is shown below in its straight-chain and ring
forms.
A) Put an asterisk next to each chiral carbon in the
straight-chain form of D-glucose.
B) Label the given ring forms as the alpha or beta anomer of
D-glucose. Draw the other anomer. Which one is more stable, the
alpha or beta anomer? Explain your logic.
H Он он но H Но Но Н он H он он н но но
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use...
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use open chain Fisher projection). 2. Do you expect fructose to give a positive reaction with Barfoed's reagent? Explain why or why not. Indicate which of the test carbohydrates (glucose, fructose, lactose, sucrose, starch) would give 5- hydroxymethylfurfural when heated with hydrochloric acid. (See description of reactions for Barfoed's reagent and Seliwanoffs reagent). 3. 121
7. Trehalose contains two a-glucose units linked by a (1-1) glycosidic bond. Draw its structure as...
7. Trehalose contains two a-glucose units linked by a (1-1) glycosidic bond. Draw its structure as a Haworth formulation. 3. Benedict's reagent is used to detect what? What does a positive result for this test look like? 4. Tollen's reagent is used to detect what? What does a positive result for this test look like?
Compleat molecular and structural formulas for D- fructose glucose (Colli's-Tollens' and Haworth (a and B pyranose;...
Compleat molecular and structural formulas for D- fructose glucose (Colli's-Tollens' and Haworth (a and B pyranose; a and B furanose). Name all the formulas and indicate the hemiacetal hydroxyl. Write the equations of glucose interaction with: 1. Cu(OH)2; 2.HNO3; 3.CH31; 4.02. Write down what can be observed if you add sodium hydroxide solution to lactose first and then copper(II) sulfate solution (a) without heating; (b) without heating. Compleat molecular and structural formulas for a,D- fructose. Why is fructose a no...
Glucose generally exists in ring (cyclic) form. A Haworth projection shows the orientations of the hydroxyl groups and hydrogen atoms on the ring. Draw the alpha and beta forms of glucose by moving the groups (H, OH, or CH2OH) to the appropriate positions.
Draw the Haworth Projection for the compound represented by
this model.
also need help answering these questions that go along with
the model i included
Model 5 (This model does not rotate) Н H CH,OH С C НО НО C Н C с. H ОН) ОН Н (b) Haworth projection formulas of cyclic monosaccharides. View model #5 of the cyclic monosaccharide and answer the following: • Is the ring structure a pyranose (6 sides) or a furanose (5 sides): •...
CARBOHYDRATES POST-LAB QUESTIONS CONT'D 23.Draw the Haworth structure of lactose and explain why this disaccharide gives a positive Benedict's test; make sure to circle the part of the structure that is responsible for the reaction with Benedict's reagent. [5pts) Haworth Projection: (2.5 points) Hemiacetal circled / indicated (2.5 points) CARBOHYDRATES POST-LAB QUESTIONS CONT'D 24. When Benedict's reagent reacts with a reducing sugar, it oxidizes the aldehyde functional group to a carboxylic acid. As seen in the figure below: only a...
13) Consider the ring structure of B-D-glucose. It will give a positive test as a reducing sugar. Describe how can that happen?
D-glucose is shown below in its straight-chain and ring
forms.
A) Put an asterisk next to each chiral carbon in the
straight-chain form of D-glucose.
B) Label the given ring forms as the alpha or beta anomer of
D-glucose. Draw the other anomer. Which one is more stable, the
alpha or beta anomer? Explain your logic.
H Он он но H Но Но Н он H он он н но но
1. Show the chemical reaction that takes place when Benedict's reagent (Cu") reacts with glucose (use open chain Fisher projection). 2. Do you expect fructose to give a positive reaction with Barfoed's reagent? Explain why or why not. Indicate which of the test carbohydrates (glucose, fructose, lactose, sucrose, starch) would give 5- hydroxymethylfurfural when heated with hydrochloric acid. (See description of reactions for Barfoed's reagent and Seliwanoffs reagent). 3. 121
7. Trehalose contains two a-glucose units linked by a (1-1) glycosidic bond. Draw its structure as a Haworth formulation. 3. Benedict's reagent is used to detect what? What does a positive result for this test look like? 4. Tollen's reagent is used to detect what? What does a positive result for this test look like?
Compleat molecular and structural formulas for D- fructose glucose (Colli's-Tollens' and Haworth (a and B pyranose; a and B furanose). Name all the formulas and indicate the hemiacetal hydroxyl. Write the equations of glucose interaction with: 1. Cu(OH)2; 2.HNO3; 3.CH31; 4.02. Write down what can be observed if you add sodium hydroxide solution to lactose first and then copper(II) sulfate solution (a) without heating; (b) without heating. Compleat molecular and structural formulas for a,D- fructose. Why is fructose a no...
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