Question 1

Which of the following sugars can be classified as a ketohexose?

Accepted Answer

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

Question 2

Upon hydrolysis of cellulose, what sugar is formed?

Accepted Answer

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

Question 3

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 4

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 5

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 6

Which of the following sugars can be classified as a ketotetrose?

Accepted Answer

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

Question 7

Which is the correct Haworth projection for the aanomer of allose?

Accepted Answer

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

Question 8

How many possible stereoisomers are there of the following heptose?

Accepted Answer

A) 16 
B) 21 
C) 32 
D) 64 
A) 16 
B) 21 
C) 32 
D) 64

Question 9

Upon hydrolysis of amylopectin, what sugar is formed?

Accepted Answer

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

Question 10

Upon hydrolysis of amylose, what sugar is formed?

Accepted Answer

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

Question 11

What is the composition of lactose?

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 12

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 13

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 14

Which of the following sugars can be classified as an aldohexose?

Accepted Answer

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

Question 15

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 16

After a series of Kiliani-Fischer syntheses on D-glyceraldehyde, an unknown sugar was isolated from the reaction mixture.The following experimental data was obtained.What is the structure of this unknown sugar?
Data:
- Molecular formula: C6H12O6
- Reacts with phenylhydrazine to give an osazone, mp 178°C.- Reacts with HNO3 to give an optically active aldaric acid.- Wohl degradation followed by HNO3 oxidation gives an optically inactive
Aldaric acid.- Two Wohl degradations followed by HNO3 oxidation give a meso-tartaric acid.

Accepted Answer

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

Question 17

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

Question 18

From the sugars shown below, which one is a non-reducing sugar?

Accepted Answer

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

Exam 28: Carbohydrates

Which of the following sugars can be classified as a ketohexose?

Upon hydrolysis of cellulose, what sugar is formed?

What are the products of the following reaction?

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

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

Which of the following sugars can be classified as a ketotetrose?

Which is the correct Haworth projection for the aanomer of allose?

How many possible stereoisomers are there of the following heptose?

Upon hydrolysis of amylopectin, what sugar is formed?

Upon hydrolysis of amylose, what sugar is formed?

What is the composition of lactose?

What is the composition of sucrose?

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

Which of the following sugars can be classified as an aldohexose?

What is the composition of maltose?

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?

From the sugars shown below, which one is a non-reducing sugar?

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

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Amino Acids and Proteins

Synthetic Polymers

Lipids

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