Question 1

Which sugar is represented by the line angle structure below?

Accepted Answer

A) D-fructose 
B) D-sorbose 
C) L-psicose 
D) L-tagatose 
A) D-fructose 
B) D-sorbose 
C) L-psicose 
D) L-tagatose

Question 2

Does a monosaccharide prefer to exist in the open-chain or closed-ring form?

Accepted Answer

A) Open 
B) Closed 
C) Both forms exist in equal ratios. 
A) Open 
B) Closed 
C) Both forms exist in equal ratios.

Question 3

Amylose is a polysaccharide with ________ linkages.

Accepted Answer

A) b-1,4'-glycosidic 
B) a-1,4'-glycosidic 
C) b-1,6'-glycosidic 
D) a-1,6'-glycosidic 
A) b-1,4'-glycosidic 
B) a-1,4'-glycosidic 
C) b-1,6'-glycosidic 
D) a-1,6'-glycosidic

Question 4

Which of the following reagents will selectively oxidize an aldose to an aldonic acid?

Accepted Answer

A) PCC 
B) Ag2O in NH4OH 
C) FeCl3 
D) HNO3 
A) PCC 
B) Ag2O in NH4OH 
C) FeCl3 
D) HNO3

Question 5

What is the composition of sucrose?

Accepted Answer

A) Two glucose units with a a-1,4'-glycoside bond 
B) One glucose and one fructose unit with a a-glycosidic bond to the 2' carbon of a fructofuranose ring 
C) One galactose and one glucose unit with a b-1,4'-glycoside bond 
D) Repeating unit of glucose units joined in a b-1,4'-glycosidic linkage 
A) Two glucose units with a a-1,4'-glycoside bond 
B) One glucose and one fructose unit with a a-glycosidic bond to the 2' carbon of a fructofuranose ring 
C) One galactose and one glucose unit with a b-1,4'-glycoside bond 
D) Repeating unit of glucose units joined in a b-1,4'-glycosidic linkage

Question 6

What is the correct chair form for the banomer of D-glucose?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 7

What is the best description of the product formed in the following reaction sequence?

Accepted Answer

A) The product is an optically active aldonic acid. 
B) The product is an optically inactive aldonic acid. 
C) The product is an optically active aldaric acid. 
D) The product is an optically inactive aldaric acid. 
A) The product is an optically active aldonic acid. 
B) The product is an optically inactive aldonic acid. 
C) The product is an optically active aldaric acid. 
D) The product is an optically inactive aldaric acid.

Question 8

Which is the correct Haworth projection for the banomer of D-glucose?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 9

Which of the following is D-sorbose?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 10

From the sugars shown below,which one will not give a positive test with Tollens reagent?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 11

Which of the following compounds is an aldose?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 12

Which of the following best describes the relationship between D-glucose and D-fructose?

Accepted Answer

A) Enantiomers 
B) Epimers 
C) Anomers 
D) Constitutional isomers 
A) Enantiomers 
B) Epimers 
C) Anomers 
D) Constitutional isomers

Question 13

From the disaccharides listed below,which one will not undergo mutarotation?

Accepted Answer

A) Sucrose 
B) Maltose 
C) Lactose 
D) Xylobiose 
A) Sucrose 
B) Maltose 
C) Lactose 
D) Xylobiose

Question 14

What are the products of the following reaction?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 15

What is the Fischer projection of the monosaccharide from which the following glycoside was prepared?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 16

What is the composition of maltose?

Accepted Answer

A) Two glucose units with a a-1,4'-glycoside bond 
B) One glucose and one fructose unit with a a-glycosidic bond to the 2' carbon of a fructofuranose ring 
C) One galactose and one glucose unit with a b-1,4'-glycoside bond 
D) Repeating unit of glucose units joined in a b-1,4'-glycosidic linkage 
A) Two glucose units with a a-1,4'-glycoside bond 
B) One glucose and one fructose unit with a a-glycosidic bond to the 2' carbon of a fructofuranose ring 
C) One galactose and one glucose unit with a b-1,4'-glycoside bond 
D) Repeating unit of glucose units joined in a b-1,4'-glycosidic linkage

Question 17

Which of the following is a reducing sugar?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
A) A 
B) B 
C) C 
D) D

Question 18

Which of the following pairs of carbohydrates will afford the same product from a Wohl degradation?

Accepted Answer

A) Xylose/glucose 
B) Ribose/arabinose 
C) Fructose/mannose 
D) Lyxose/threose 
A) Xylose/glucose 
B) Ribose/arabinose 
C) Fructose/mannose 
D) Lyxose/threose

Question 19

Which of the following compounds is not a valid representation for D-glucose?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 20

The following reaction is an example of a base-catalyzed epimerization reaction in which a ketose is converted to a pair of aldoses.What are the products from this reaction?

Accepted Answer

A) D-glucose and D-mannose 
B) D-galactose and D-talose 
C) D-talose and D-idose 
D) D-glucose and D-idose 
A) D-glucose and D-mannose 
B) D-galactose and D-talose 
C) D-talose and D-idose 
D) D-glucose and D-idose

Exam 26: Carbohydrates

Which sugar is represented by the line angle structure below?

Does a monosaccharide prefer to exist in the open-chain or closed-ring form?

Amylose is a polysaccharide with ________ linkages.

Which of the following reagents will selectively oxidize an aldose to an aldonic acid?

What is the composition of sucrose?

What is the correct chair form for the banomer of D-glucose?

What is the best description of the product formed in the following reaction sequence?

Which is the correct Haworth projection for the banomer of D-glucose?

Which of the following is D-sorbose?

From the sugars shown below,which one will not give a positive test with Tollens reagent?

Which of the following compounds is an aldose?

Which of the following best describes the relationship between D-glucose and D-fructose?

From the disaccharides listed below,which one will not undergo mutarotation?

What are the products of the following reaction?

What is the Fischer projection of the monosaccharide from which the following glycoside was prepared?

What is the composition of maltose?

Which of the following is a reducing sugar?

Which of the following pairs of carbohydrates will afford the same product from a Wohl degradation?

Which of the following compounds is not a valid representation for D-glucose?

The following reaction is an example of a base-catalyzed epimerization reaction in which a ketose is converted to a pair of aldoses.What are the products from this reaction?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols,ethers,and Related Compounds

Alkenes and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation, resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives - Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Amino Acids and Proteins

Synthetic Polymers

Lipids

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Organic Spectroscopy Concepts

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