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Exam 25: Carbohydrates

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Question 21

True/False

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The difference between the pyranose and furanose forms of a given aldohexose is the ring size.

A) True
B) False

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Question 22

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Which of the following represents a furanose?

A) only 1
B) only 2
C) only 3
D) only 2 and 3

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

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Question 23

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The number of the anomeric carbon in the following structure is _____.

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

The textile rayon is produced by treatment of cellulose with carbon disulfide in aqueous sodium hydroxide. What type of functional group is introduced on the cellulose under these conditions?

Consider the following Fisher projections. They all convert to the same tetrahedral representation as shown below..

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -Structure ____ represents a ketohexose.

The name of the following Fischer projection including stereochemistry is _____________________.

Consider the following structures. Answer the following questions by placing the appropriate number or indicated letter in the blank. -Structure ____ represents a aldopentose.

Which of the following has a D-configuration?

Identify the following compound. ​

Oxidation of optically active D-erythrose with nitric acid produces optically inactive meso-tartaric acid (below). The structure of D-erythrose is shown below.

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

Which of the following represents a pyranose?

Identify the products of the following reaction. ​

Which of the following is an alditol?

There are only 2 trioses: the aldotriose 2,3-dihydroxypropanal and the ketotriose _____.

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.

Which of the following is vitamin C?

Which of the following structures represent the same carbohydrate?