Answered: there you found that labels had fallen…

there you found that labels had fallen off from the bottles containing D-lyxose and D-xylose. How could you determine which bottle contains D- lyxose?

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter63: Carbohydrates And Sweeteners

Section: Chapter Questions

Problem 4Q

See similar textbooks

Related questions

Q: Which D-aldopentose is oxidized to an optically active aldaric acid and undergoes the Wohl…

A: The oxidation of D-aldopentose to an optically active aldaric acid is given below.

Q: What aldoses are formed when the following aldoses are subjected to the Kiliani-Fischer synthesis:…

A: a) D-threose = The aldose synthesised by Killiani-Fischer synthesis from the given aldose is, Here,…

Q: Calculate the percentages of α-d-glucose and b-d-glucose present at equilibrium from the specific…

A: SOLUTION: Step 1: D-glucose exists in two cyclic forms; α -D-glucose and β -D-glucose. The OH group…

Q: Ruff degradation of d-arabinose gives d-erythrose. The Kiliani–Fischer synthesis converts…

Q: 6. Draw an arrow pushing mechanism for the formation of the chemically labeled cells prepared via…

A: this is a staudinger reaction. Here ring pph2 attack the -N3 and form the ph3p=0 and -NH2, Then this…

Q: Which of the d-aldopentoses will give optically active aldaric acids on oxidation with HNO3 ?(

A: The D-aldopentoses which which give optically active aldaric acids on oxidation with HNO3 are D-…

Q: An aldopentose "O", is oxidized with HNO3 to a diacid "P" which is optically active. The compound…

A: Compounds with mirror plane are optically inactive.

Q: Give the Kiliani Fischer synthesis of D-talose

Q: Show the product that results when fructose is treated with an excess of methyl iodideand silver…

A: Given data : Show the product that results when fructose is treated with an excess of methyl…

Q: The tartaness of some wines is high concentration of l malate.write a consequence of reactions…

A: Under anaerobic conditions means absence of oxygen, yeast will utilize carbon dioxide to ferment.…

Q: To synthesize D-galactose, a student went to the stockroom to get some D-lyxose to use as a starting…

A: On treating the d-lyxose with HNO3 and an optically active is produced, reaction shown below.

Q: Below are drawn the different chair conformations of the methyl glycoside of galactose. но он но он…

A: II) The name of compound is alpha- acetyl mannose.

Q: Identify the sugar in each description. a. An aldopentose that is not d-arabinose forms d-arabinitol…

A: Sodium borohydride is used as a reducing agent (addition of hydrogen). Its molecular formula is…

Q: (d) Provide L-ascorbic acid from' D-glucose. the synthetic scheme for

A: Synthetic scheme for L-ascorbic acid from D-glucose is given below

Q: Mark the TRUE option with respect to the following compounds: a) (I) is a disaccharide formed by…

A: a) can not be true because (I )is diasachride formed from one aldose sugar and one ketose sugar. b)…

Q: Compound A is a D-aldopentose that can be oxidized to an optically inactive aldaric acid B. On…

A: The class of D-aldopentoses includes five-carbon, aldehyde functional group-containing…

Q: A D-aldopentose A is reduced to an optically active alditol. Upon Kiliani–Fischer synthesis, A is…

A: The 2 D-aldopentoses, which are reduced to the optically active alditols, is shown below:

Q: The following observations are obtained after a D-hexose was made to react with (1) The reactions of…

Q: Label the IR spectra of sucrose.

A: The structure of sucrose is as follows:

Q: Compare your experimental observation on the disruption of phycocyanin folding in the presence of…

Q: Show the complete steps and products of the Haworth Projection structure of the following…

Q: Mutarotation occurs when the two anomers interconvert in solution. Outline a stepwise mechanism for…

A: The alpha and bita glucose are interconvertable. The mechanism has been drawn below

Q: The disaccharide lactulose consists of a D-galactopyranose subunit and a D-fructofuranose subunit…

A: Disaccharide are compounds that contain two monosaccharide units joined by means of glycosidic bond…

Q: Would you expect fructose or glucose to form a red color rapidly with Seliwanoff’s reagent? Explain…

A: Concept is based on practical carbohydrate chemistry.

Q: II. Analysis. Given below is a schematic diagram for a simple analysis of a novel tetrasaccharide…

A: D- fructose. B- glucose . C - galactose . As A gives Benedict's test: (+) Seliwanoff's test: (-)…

Q: n a laboratory experiment, a student was given an unknown compound. After performing the test for…

A: There are several tests for the qualitative analysis of carbohydrates: Molisch’s test : It is a…

Q: Is gentiobiose a reducing sugar? Does it mutarotate? Explain your reasoning

A: Gentiobiose is a naturally occurring carbohydrate. It is composed of two glucose units which are…

Q: According to the proposed schemes, write the equations of reactions. Be sure to write down the…

Q: Mutarotation occurs when the two anomers interconvert in solution. Outline a stepwise mechanism for…

A: The change in optical rotation observed when glucose dissolved in water. This is due to…

Q: When glucose undergoes base-catalyzed isomerization in the absence of the enzyme, mannose is one of…

Q: Show the structures of the following and give their names: C-2 epimer of D-galactose

A: Hello. Since the question contains multiple parts only the first part is solved. In case the…

Q: Draw the products from Killiani-Fischer reaction of D-ribose and L-Xylose.

A: Kiliani fischer synthesis is a chain elongation reaction of carbohydrates in which we synthesize a…

Q: Illustrate the treatment of methyl α-D-glucopyranoside with aqueous acid forms a mixture of α- and…

A: In methyl α-D-glucopyranoside, methoxy group, (-OCH3) is attached to carbon 1 and in the presence of…

Q: Given solution: 5%lactose, 5% glucose, 5% maltose, 5% fructose, 5% galactose, 5% arabinose, 5%…

A: The sugar solutions given are 1. 5% lactose 2. 5% glucose 3. 5% maltose 4. 5% fructose 5. 5%…

Q: What is a reducing sugar? What other types of sugars besides glucose might you measure using the…

A: Reducing Sugar - Reducing sugars are the sugars which having a capability of reducing oxidizing…

Q: Why must enantiomers be converted to diastereomers before separation processes such as…

A: Given : Enantiomers must be converted to diastereomers before separation processes such as…

Q: d-Xylose and d-lyxose are formed when d-threose undergoes a Kiliani–Fischer synthesis. d-Xylose is…

A: In carbohydrates, we studied carbohydrates containing five carbon atoms. Here we will discuss the…

Q: structure of beta anomers of alpha D- mannopyranose and give their names

Q: Deduce the structure of trehalose using 2,3,4,6-tetra-O-methyl-D-glucopyranose

Q: A D-aldopentose A is reduced to an optically active alditol. Upon Kiliani–Fischer synthesis, A is…

A: The layout of the given reaction sequence is shown below:

Q: Topic: extraction of Flavonoid glycosides and assessment of antioxidant What is the indication of…

A: Iodine test for confirmation of presence of unsaturation.

Q: 2. Which of the sugar solution gave a negative/ positive test with Orcinol reagent? Why? What is the…

A: To find: the sugar that gave a positive test with orcinol reagent? purpose of the test? how…

Q: When the pentaacetate anomer obtained in this reaction is heated with ZnCl2 and acetic anhydride, it…

A: The pentaacetate anomer is obtained . This reaction is heated with ZnCl2 and acetic anhydride .It is…

Concept explainers

Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.

Question

Assume that for your Biochemistry practical, you were asked to synthesise D-Galactose. You went to chemical storage room to take some D-lyxose to use as the starting material. But there you found that labels had fallen off from the bottles containing D-lyxose and D-xylose. How could you determine which bottle contains D- lyxose?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

An unknown β-d-aldohexose has only one axial substituent. A Wohl degradation forms a compound which, when treated with sodium borohydride, forms an optically active alditol. This information allows you to arrive at two possible structures for the β-d-aldohexose. What experiment can you carry out to distinguish between the two possibilities?
d-Xylose and d-lyxose are formed when d-threose undergoes a Kiliani–Fischer synthesis. d-Xylose is oxidized to an optically inactive aldaric acid,whereas d-lyxose forms an optically active aldaric acid. What are the structures of d-xylose and d-lyxose?
Emil Fischer synthesized l-gulose, an unusual aldohexose that reduces to give d-glucitol.Suggest a structure for this l sugar, and show how l-gulose gives the same alditol asd-glucose. (Hint: d-Glucitol has ¬CH2OH groups at both ends. Either of these primaryalcohol groups might have come from reduction of an aldehyde.)
To synthesize D-galactose, a student went to the stockroom to get some D-lyxose to use as a starting material. She found that the labels had fallen off the bottles containing D-lyxose and D-xylose. How can she determine which bottle contains D-lyxose?
Ruff degradation of d-arabinose gives d-erythrose. The Kiliani–Fischer synthesis converts d-erythrose to a mixture of d-arabinose and d-ribose. Draw out these reactions, andgive the structure of d-ribose
We did an experiment about carbohydrate chemistry and the prof did not elaborate on the details. She just gave the positive result and reagent. I am would like to ask the following: 1. What type of reaction occurred when the samples (enumerated) reacted with the Seliwanoff’s reagent? Give the chemical equation for each.a. Glucoseb. Sucrosec. Fructosed. Lactosee. Galactosef. Ribose 2. Explain the mechanism behind the test in simple terms. 3. What are the important products of the reaction of each sample?
We did an experiment about carbohydrate chemistry and the prof did not elaborate on the details. She just gave the positive result and reagent. I would like to ask the following: 1. What type of reaction occurred when the samples (enumerated) reacted with Fehling’s reagent A and B? Give the chemical equation for each.a. Glucoseb. Sucrosec. Fructosed. Lactosee. Galactosef. Ribose 2. Explain the mechanism behind the test in simple terms. 3. What are the important products of the reaction of each sample?
Predict whether d-altrose exists preferentially as a pyranose or a furanose.
Esterase is an enzyme that catalyzes the hydrolysis of esters. It hydrolyzes esters of L-amino acids more rapidly than esters of d-amino acids. How can this enzyme be used to separate a racemic mixture of amino acids?
An important technique for establishing relative configurations among isomeric aldoses and ketoses is to convert both terminal carbon atoms to the same functional group. This can be done either by selective oxidation or reduction. As a specific example, nitric acid oxidation of d-erythrose gives meso-tartaric acid . Similar oxidation of d-threose gives (2S,3S)-tartaric acid. Given this information and the fact that d-erythrose and d-threose are diastereomers, draw Fischer projections for d-erythrose and d-threose. Check your answers against Table 25.1.
Show the product that results when fructose is treated with an excess of methyl iodideand silver oxide.(b) Show what happens when the product of part (a) is hydrolyzed using dilute acid.(c) What do the results of parts (a) and (b) imply about the hemiacetal structure of fructose?
Why is molecule "A" the major acetal formed when d-erythrose reacts with H2SO4 and acetone as opposed to molecule "B"?