Exam 22: Carbohydrates

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What products are expected to be formed upon subjecting D-galactose (shown below)to the following reaction sequence? (Draw Fischer projection formulas) i)Br₂,H₂O;ii)H₂O₂,Fe₂(SO₄)₃

(Essay)

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Question 21

Sugars that undergo mutarotation in neutral aqueous solution are:

(Multiple Choice)

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Question 22

Which of the following is an L-aldotetrose?

(Multiple Choice)

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Question 23

Which are the anomers?

(Multiple Choice)

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Question 24

Reaction of the following substance with sodium borohydride (NaBH4)would yield:

(Multiple Choice)

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Question 25

Which is a reducing sugar with an α-glycosidic linkage?

(Multiple Choice)

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Question 26

Which of these is an example of a glucan?

(Multiple Choice)

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Question 27

Which is not an intermediate monosaccharide in the Kiliani-Fischer synthesis of D-mannose from D-glyceraldehyde?

(Multiple Choice)

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Question 28

A pentose of the D-family gave an optically active glycaric acid (a dicarboxylic acid)on oxidation with nitric acid.The pentose was converted by the Kiliani-Fischer Synthesis into a pair of diastereoisomeric hexoses,one of which gave an optically active glycaric acid when oxidized with nitric acid and the other of which gave an optically inactive glycaric acid.What are the names and structures of the pentose and the two hexoses?

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Question 29

What is the mechanism of the hydrolysis of maltose to glucose under acidic conditions?

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Question 30

Which of the following structures represent enantiomers?

(Multiple Choice)

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Question 31

Consider the structures above.Which monosaccharides would yield the same phenylosazone when treated with excess phenylhydrazine?

(Multiple Choice)

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Question 32

Which of the following substances will afford a meso- product upon reaction with Br₂/H₂O ?

(Multiple Choice)

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Question 33

Which of these reacts with dilute HCl to produce methanol?

(Multiple Choice)

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Question 34

Consider the structures below.Which monosaccharides would yield an optically active aldonic acid when oxidized with bromine water?

(Multiple Choice)

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Question 35

Reaction of the following substance with nitric acid would yield:

(Multiple Choice)

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Question 36

The Ruff degradation is the reaction of an aldose with:

(Multiple Choice)

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Question 37

An aldaric acid is represented by:

(Multiple Choice)

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Question 38

Refer to the following structures.Which D-aldohexose would react with NaBH4 to yield an optically inactive alditol?

(Multiple Choice)

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Question 39

Which of the following structures represent epimers?

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Question 40

Showing 21 - 40 of 104

Exam 22: Carbohydrates

What products are expected to be formed upon subjecting D-galactose (shown below)to the following reaction sequence? (Draw Fischer projection formulas) i)Br2,H2O;ii)H2O2,Fe2(SO4)3

Sugars that undergo mutarotation in neutral aqueous solution are:

Which of the following is an L-aldotetrose?

Which are the anomers?

Reaction of the following substance with sodium borohydride (NaBH4)would yield:

Which is a reducing sugar with an α-glycosidic linkage?

Which of these is an example of a glucan?

Which is not an intermediate monosaccharide in the Kiliani-Fischer synthesis of D-mannose from D-glyceraldehyde?

What is the mechanism of the hydrolysis of maltose to glucose under acidic conditions?

Which of the following structures represent enantiomers?

Consider the structures above.Which monosaccharides would yield the same phenylosazone when treated with excess phenylhydrazine?

Which of the following substances will afford a meso- product upon reaction with Br2/H2O ?

Which of these reacts with dilute HCl to produce methanol?

Consider the structures below.Which monosaccharides would yield an optically active aldonic acid when oxidized with bromine water?

Reaction of the following substance with nitric acid would yield:

The Ruff degradation is the reaction of an aldose with:

An aldaric acid is represented by:

Refer to the following structures.Which D-aldohexose would react with NaBH4 to yield an optically inactive alditol?

Which of the following structures represent epimers?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

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What products are expected to be formed upon subjecting D-galactose (shown below)to the following reaction sequence? (Draw Fischer projection formulas) i)Br₂,H₂O;ii)H₂O₂,Fe₂(SO₄)₃

Which of the following substances will afford a meso- product upon reaction with Br₂/H₂O ?