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Is the following carbohydrate D or L? Provide an explanation for your answer. Is the following carbohydrate D or L? Provide an explanation for your answer. A) It is D because the OH group on C2 is on the right. B) It is L because the OH group on C4 is on the left. C) It is L because the OH group on C3 is on the left. D) It is D because the sugar is not symmetric.


A) It is D because the OH group on C2 is on the right.
B) It is L because the OH group on C4 is on the left.
C) It is L because the OH group on C3 is on the left.
D) It is D because the sugar is not symmetric.

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

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Oxidation of a D-hexose with nitric acid forms an optically active aldaric acid.A Wohl degradation of the same D-hexose followed by oxidation with nitric acid forms an optically active aldaric acid.What are the three possible D-hexoses that fit this data?


A) D-allose,D-altrose and D-glucose
B) D-glucose,D- mannose and D-talose
C) D-glucose,D-idose and D-altrose
D) D-galactose,D-talose and D-mannose

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

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B

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


A) EtBr,aq.HCl
B) EtOH,aq.HCl
C) EtOH,NaOH
D) Ag2O in NH4OH

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

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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. 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: C<sub>6</sub>H<sub>12</sub>O<sub>6</sub> - Reacts with phenylhydrazine to give an osazone,mp 178°C. - Reacts with HNO<sub>3</sub> to give an optically active aldaric acid. - Wohl degradation followed by HNO<sub>3</sub> oxidation gives an optically inactive Aldaric acid. - Two Wohl degradations followed by HNO<sub>3</sub> oxidation give a meso-tartaric acid. A) A B) B C) C D) D


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

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

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Which of the following sugars can be classified as a ketotetrose? Which of the following sugars can be classified as a ketotetrose? A) A B) B C) C D) D


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

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

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Which of the following is D-glucose? Which of the following is D-glucose? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) All of the above
F) B) and C)

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What is the Fischer projection of the monosaccharide from which the following glycoside was prepared? What is the Fischer projection of the monosaccharide from which the following glycoside was prepared? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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

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B

How many possible stereoisomers are there of the following heptose? How many possible stereoisomers are there of the following heptose? A) 16 B) 21 C) 32 D) 64


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

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

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How many carbons does a pentose sugar have?


A) 2
B) 3
C) 4
D) 5

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

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Which of the following is D-galactose? Which of the following is D-galactose? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

E) A) and B)
F) All of the above

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Which of the following sugars can be classified as a ketohexose? Which of the following sugars can be classified as a ketohexose? A) A B) B C) C D) D


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

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

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A

Which of the following is D-fructose? Which of the following is D-fructose? A) I B) II C) III D) IV


A) I
B) II
C) III
D) IV

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

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What is the composition of lactose?


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

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

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Which of the following is a polysaccharide?


A) Cellulose
B) Starch
C) Glycogen
D) All of these choices are correct

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

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Which of the following sugars can be classified as an aldohexose? Which of the following sugars can be classified as an aldohexose? A) A B) B C) C D) D


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

E) All of the above
F) C) and D)

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Cellulose is a polysaccharide with ________ linkages.


A) b-1,4'-glycosidic
B) a-1,4'-glycosidic
C) b-1,6'-glycosidic
D) a-1,6'-glycosidic

E) C) and D)
F) All of the above

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Upon hydrolysis of amylopectin,what sugar is formed?


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

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

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Which is the correct Haworth projection for the aanomer of allose? Which is the correct Haworth projection for the aanomer of allose? A) A B) B C) C D) D


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

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

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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) None of the above
F) C) and D)

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Which of the following is a disaccharide?


A) Maltose
B) Lactose
C) Sucrose
D) All of these choices are correct

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

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