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Exam 25: Carbohydrates

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Question 21

True/False

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

A) True
B) False

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Question 22

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

A) constitutional isomers
B) enantiomers
C) diastereomers
D) tautomers

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

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Question 23

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

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

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

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?

Which of the following represents a furanose?

Which of the following is an alditol?

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

Which of the following is vitamin C?

Which of the following has a D-configuration?

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.

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

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

Which of the following structures represent the same carbohydrate?

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

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

Identify the products of the following reaction. ​

Identify the following compound. ​

Which of the following represents a pyranose?