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Exam 26: Carbohydrates

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Question 1

Multiple Choice

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What are the products of the following reaction?

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

E) None of the above
F) A) and C)

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D

Question 2

Multiple Choice

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What is the classification of pyranose forms of monosaccharides?

A) 5-Membered cyclic hemiacetals
B) 6-Membered cyclic acetals
C) 5-Membered cyclic acetals
D) 6-Membered cyclic hemiacetals

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

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Question 3

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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?

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

What is the process called for the interconversion of one anomer to the other?

Which of the following compounds is a b anomer?

Upon hydrolysis of cellulose,what sugar is formed?

Which of the following reagents would convert glucose into ethyl glucopyranoside?

Which of the following compounds is an aldose?

What is the Haworth projection of the α anomer of a monosaccharide epimeric with D-glucose at C3?

Which is the correct Fischer projection for the open-chain form of the carbohydrate shown below?

Cellulose is a polysaccharide with ________ linkages.

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.

Amylose is a polysaccharide with ________ linkages.

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

Which of the following is D-galactose?

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

Which sugar is represented by the line angle structure below?

How many possible stereoisomers are there of the following heptose?

The branching units in amylopectin,a polysaccharide,which enable this molecule to be water soluble are connected with ________ linkages.