Question 1

What is the structure for A?

Accepted Answer

The answer of What is the structure for A? ...

Question 2

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

Accepted Answer

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

Question 3

Which of these is α-D-glucopyranose?

Accepted Answer

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

Question 4

Refer to the following structures.Which aldohexose when subjected to Fischer's end-group interchange would be converted to a compound identical with itself?

Accepted Answer

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

Question 5

A monosaccharide containing six carbon atoms and an aldehyde functionality is called an _____________.

Accepted Answer

The answer of A monosaccharide containing six carbon atoms and...

Question 6

The pyranose form of an aldohexose which can react 1:2 with acetone in the presence of acid is which of these?

Accepted Answer

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

Question 7

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

Question 8

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 9

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

Accepted Answer

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

Question 10

Which of the following would yield D-glucose and D-mannose when subjected to a Kiliani-Fischer synthesis?

Accepted Answer

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

Question 11

Which reagent would be used for the following transformation?

Accepted Answer

A)  CH3OH/HCl 
B)  AgNO3/C2H5OH 
C)  Br2/CCl4 
D)  KMnO4 
E)  HIO4 
A)  CH3OH/HCl 
B)  AgNO3/C2H5OH 
C)  Br2/CCl4 
D)  KMnO4 
E)  HIO4

Question 12

A D-aldohexose,Z,is subjected to a Ruff degradation.The degradation product is treated with nitric acid to yield an optically active aldaric acid.A possible structure for Z is:

Accepted Answer

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

Question 13

Carbohydrates are synthesized in green plants by _____________.

Accepted Answer

The answer of Carbohydrates are synthesized in green plants by...

Question 14

Which of the following is a D-aldotetrose?

Accepted Answer

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

Question 15

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?

Accepted Answer

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

Question 16

α-D-Glucose has [α]D = +112o,and β-D-glucose has [α]D = +19o.If either anomer is dissolved in water and allowed to reach equilibrium,the specific rotation of the solution is + 52o.What are the percentages of each anomer at equilibrium?

Accepted Answer

Percentage of the anomer β at

Question 17

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 18

Complete the following reaction:

Accepted Answer

The answer of Complete the following reaction:  ...

Question 19

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 20

Consider the structures below.An L-aldohexose,X,is treated with nitric acid to yield an optically inactive aldaric acid.The same L-aldohexose,X,is subjected to a Ruff degradation and the degradation product is oxidized with nitric acid to produce an optically inactive aldaric acid.Which is a possible structure for X?

Accepted Answer

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

Exam 22: Carbohydrates

What is the structure for A?

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

Which of these is α-D-glucopyranose?

Refer to the following structures.Which aldohexose when subjected to Fischer's end-group interchange would be converted to a compound identical with itself?

A monosaccharide containing six carbon atoms and an aldehyde functionality is called an _____________.

The pyranose form of an aldohexose which can react 1:2 with acetone in the presence of acid is which of these?

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

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

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

Which of the following would yield D-glucose and D-mannose when subjected to a Kiliani-Fischer synthesis?

Which reagent would be used for the following transformation?

A D-aldohexose,Z,is subjected to a Ruff degradation.The degradation product is treated with nitric acid to yield an optically active aldaric acid.A possible structure for Z is:

Carbohydrates are synthesized in green plants by _____________.

Which of the following is a D-aldotetrose?

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?

α-D-Glucose has [α]D = +112o,and β-D-glucose has [α]D = +19o.If either anomer is dissolved in water and allowed to reach equilibrium,the specific rotation of the solution is + 52o.What are the percentages of each anomer at equilibrium?

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

Complete the following reaction:

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?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

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

α-D-Glucose has [α]_D = +112^o,and β-D-glucose has [α]_D = +19^o.If either anomer is dissolved in water and allowed to reach equilibrium,the specific rotation of the solution is + 52^o.What are the percentages of each anomer at equilibrium?