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Exam 25: Carbohydrates

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Question 21

Multiple Choice

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From the sugars below, choose the one that best fits each description below. Place the letter of the sugar in the blank to the left of the description. There is only one correct answer for each question. -_____ is a deoxy sugar.

A)
B)
C)
D)

E) B) and D)
F) A) and C)

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Question 22

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A 1,4- $\alpha$ -linkage between two glucose units produces a disaccharide called maltose.

A) True
B) False

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Question 23

Multiple Choice

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Which of the following represent a ketose?

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -The structures that represent reducing sugars are: a. only the ketoses. b. only the aldoses. c. all of these structures.

Which of the following structures represent the same carbohydrate?

The following are two different methods of representing the same structure.

What is the relationship between D-erythrose and D-threose?

Which of the following structures represent the same carbohydrate?

What is the major organic product obtained from the reaction of glucose with glucose oxidase?

What is the major organic product obtained from the following reaction?

Complete the structure on the right so that it represents the pyranose form of the carbohydrate shown on the left as a Fischer projection. Place the substituents carefully so that their position in axial or equatorial positions accurately reflects the stereochemistry of the carbohydrate.

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -The formula for maltose is: The number of the acetal carbon is _____.

What is the relationship between D-threose and L-threose?

A glycoside is formed upon reaction of glucopyranose with NaBH₄.

What is the major organic product obtained from the following reaction?

From the sugars below, choose the one that best fits each description below. Place the letter of the sugar in the blank to the left of the description. There is only one correct answer for each question. -_____ is a sugar with three chirality centers.

What are the two major organic products obtained from the following reaction? What is the relationship between them? (What type of isomers are they?)

From the sugars below, choose the one that best fits each description below. Place the letter of the sugar in the blank to the left of the description. There is only one correct answer for each question. -The name of the following Fischer projection including stereochemistry is _____________________.

What are the R/S stereochemical designations of C2 and C3 of D-erythrose?

Complete the structure on the right so that it represents the pyranose form of the carbohydrate shown on the left as a Fischer projection. Place the substituents carefully so that their position in axial or equatorial positions accurately reflects the stereochemistry of the carbohydrate.