Question 1

Sugars that give positive tests with Benedict's or Tollens' solution are called ___.

Accepted Answer

The answer of Sugars that give positive tests with Benedict's...

Question 2

Which reagent would be used for the following transformation? 3) 2+ B) HNO3 C) Br2/H2O D) HCl E) Ag(NH3) 2+ and Br2/H2O" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Ag(NH3) 2+
B)  HNO3
C)  Br2/H2O
D)  HCl
E)  Ag(NH3) 2+ and Br2/H2OF) A) and D)
G) B) and C) E

Question 3

What products are expected from the reaction of 3-hydroxy-2,4-pentanedione with 2 molar equivalents of periodic acid?

Accepted Answer

The answer of What products are expected from the reaction...

Question 4

Sucrose reacts with which of these reagents?

Accepted Answer

A)  C6H5NHNH2
B)  Cu2+
C)  Br2/H2O
D)  H3O+
E)  Ag(NH3) 2+F) A) and D)
G) All of the above

Question 5

How many stereoisomers of the l series would exist for the following pentose? O=CHCHOHCHOHCHOHCH2OH

Accepted Answer

A)  2
B)  3
C)  4
D)  5
E)  8F) A) and B)
G) A) and C)

Question 6

A compound X reacts with 3 mol of HIO4 to yield 2 mol of HCO2H and 2 mol of HCHO.What is the structure of X? 4 to yield 2 mol of HCO2H and 2 mol of HCHO.What is the structure of X?   A) I B) II C) III D) IV E) V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) C) and D)
G) B) and E)

Question 7

Which of these pyranose forms of an aldohexose can react with two equivalents of acetone in the presence of acid ?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) D) and E)
G) A) and C)

Question 8

Which of the following is a d-aldotetrose?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) C) and E)
G) A) and D)

Question 9

The Kiliani-Fischer synthesis is the reaction of an aldose with:

Accepted Answer

A)  Br2/H2O; then HCN; then H3O+; then Na-Hg,H2O
B)  HCN; then Ba(OH) 2; then H3O+; then Na-Hg,H2O
C)  HCN; then H3O+; then Ba(OH) 2; then Na-Hg,H2O
D)  Br2/H2O; then H2O2,Fe2(SO4) 3
E)  Br2/H2OF) C) and E)
G) B) and C)

Question 10

Which of the following is the structure of d-galacturonic acid?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) All of the above
G) None of the above

Question 11

Reaction of the following substance with bromine water would yield:

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) A) and D)
G) B) and C)

Question 12

The method of lengthening the carbon chain of an aldose through the addition of HCN followed by hydrolysis and reduction is called the ___.

Accepted Answer

Kiliani-Fi...

Question 13

Which monosaccharide is recovered from the hydrolysis of starch?

Accepted Answer

A)  d-Galactose
B)  d-Gulose
C)  d-Glucose
D)  Cellobiose
E)  MaltoseF) B) and C)
G) A) and B)

Question 14

Which of these compounds,I,II,III,IV,is a reducing disaccharide?

Accepted Answer

A)  I alone
B)  II alone
C)  III alone
D)  IV alone
E)  I,II,III,and IVF) A) and B)
G) All of the above

Question 15

Cellulose lacks nutritive value for humans because:

Accepted Answer

A)  the products of its digestion are excreted without utilization.
B)  its conformation prevents attack by digestive enzymes.
C)  we lack the enzymes which can catalyze the hydrolysis of the glycosidic linkages.
D)  it passes through the digestive tract so rapidly.
E)  the molecules possess such a high molecular weight that enzymes can not hydrolyze it.F) B) and C)
G) C) and D)

Question 16

When naturally occurring aldotetrose A is reduced with sodium borohydride,meso-1,2,3,4-butanetetrol is formed.What are the name and structure of A?

Accepted Answer

The answer of When naturally occurring aldotetrose A is reduced...

Question 17

What is the ratio of products formed by the reaction of periodic acid with the following compound? 2C=O HCO2H CO2 I 5 1 0 II 3 3 0 III 1 5 0 IV 2 3 1 V 0 4 2 A) I B) II C) III D) IV E) V" class="answers-bank-image d-inline" rel="preload" > H2C=O HCO2H CO2 I 5 1 0
II 3 3 0
III 1 5 0
IV 2 3 1
V 0 4 2

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) C) and D)
G) B) and D)

Question 18

Reaction of the following substance with sodium borohydride (NaBH4) would yield: 4) would yield:   A) I B) II C) III D) IV E) V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  VF) A) and B)
G) C) and D)

Question 19

What are carbohydrates?

Accepted Answer

A)  I,II,III
B)  I,II
C)  II,III
D)  I,II,III,IV
E)  III,IVF) A) and B)
G) A) and C)

Question 20

What are the names of the following structures?

Accepted Answer

a)d-xylonic acid
b)d-xylaric acid
c)d-xylitol
d)d-xylose phenylosazone

Exam 22: Carbohydrates

Sugars that give positive tests with Benedict's or Tollens' solution are called ___.

Correct AnswerverifiedShow Answer

Which reagent would be used for the following transformation?

Correct AnswerverifiedE

What products are expected from the reaction of 3-hydroxy-2,4-pentanedione with 2 molar equivalents of periodic acid?

Correct Answerverified11eaa4bc_3e41_38c2_9180_5b691e0078cd_TB5902_00

Sucrose reacts with which of these reagents?

Correct AnswerverifiedShow Answer

How many stereoisomers of the l series would exist for the following pentose? O=CHCHOHCHOHCHOHCH2OH

Correct AnswerverifiedShow Answer

A compound X reacts with 3 mol of HIO4 to yield 2 mol of HCO2H and 2 mol of HCHO.What is the structure of X?

Correct AnswerverifiedShow Answer

Which of these pyranose forms of an aldohexose can react with two equivalents of acetone in the presence of acid ?

Correct AnswerverifiedShow Answer

Which of the following is a d-aldotetrose?

Correct AnswerverifiedShow Answer

The Kiliani-Fischer synthesis is the reaction of an aldose with:

Correct AnswerverifiedShow Answer

Which of the following is the structure of d-galacturonic acid?

Correct AnswerverifiedShow Answer

Reaction of the following substance with bromine water would yield:

Correct AnswerverifiedShow Answer

The method of lengthening the carbon chain of an aldose through the addition of HCN followed by hydrolysis and reduction is called the ___.

Correct AnswerverifiedKiliani-Fi...View AnswerShow Answer

Which monosaccharide is recovered from the hydrolysis of starch?

Correct AnswerverifiedShow Answer

Which of these compounds,I,II,III,IV,is a reducing disaccharide?

Correct AnswerverifiedShow Answer

Cellulose lacks nutritive value for humans because:

Correct AnswerverifiedShow Answer

When naturally occurring aldotetrose A is reduced with sodium borohydride,meso-1,2,3,4-butanetetrol is formed.What are the name and structure of A?

Correct AnswerverifiedShow Answer

What is the ratio of products formed by the reaction of periodic acid with the following compound? H2C=O HCO2H CO2 I 5 1 0 II 3 3 0 III 1 5 0 IV 2 3 1 V 0 4 2

Correct AnswerverifiedShow Answer

Reaction of the following substance with sodium borohydride (NaBH4) would yield:

Correct AnswerverifiedShow Answer

What are carbohydrates?

Correct AnswerverifiedShow Answer

What are the names of the following structures?

Correct Answerverifieda)d-xylonic acid b)d-xylaric acid c)d-xylitol d)d-xylose phenylosazone

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E

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11eaa4bc_3e41_38c2_9180_5b691e0078cd_TB5902_00

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How many stereoisomers of the l series would exist for the following pentose? O=CHCHOHCHOHCHOHCH₂OH

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A compound X reacts with 3 mol of HIO₄ to yield 2 mol of HCO₂H and 2 mol of HCHO.What is the structure of X?

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Kiliani-Fi...
View Answer

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What is the ratio of products formed by the reaction of periodic acid with the following compound? H₂C=O HCO₂H CO₂ I 5 1 0 II 3 3 0 III 1 5 0 IV 2 3 1 V 0 4 2

Correct Answer
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Reaction of the following substance with sodium borohydride (NaBH₄) would yield:

Correct Answer
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a)d-xylonic acid b)d-xylaric acid c)d-xylitol d)d-xylose phenylosazone