Question 1

Consider the reaction below to answer the following question(s).  
-Refer to instructions. Which anomer is the LEAST stable?
Q or Z

Accepted Answer

Z

Question 2

Which of the following could not form a pyranose?

Accepted Answer

A)  D-threose 
B)  D-ribose 
C)  D-lyxose 
D)  D-glucose 
E)  D-galactose 
A)  D-threose 
B)  D-ribose 
C)  D-lyxose 
D)  D-glucose 
E)  D-galactose A

Question 3

Convert the Fischer projections into tetrahedral representations, and assign R or S stereochemistry to each.
-Convert and assign:

Accepted Answer

The answer of Convert the Fischer projections into tetrahedral representations,...

Question 4

Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry.   β-D-galactopyranose
-Draw:
Ch3I, Ag2O

Accepted Answer

Question 5

The brick-red color observed when Benedict's test is applied to D-mannose is due to

Accepted Answer

A)  the reduced form of the Cu2+ reagent 
B)  the reduced form of the D-mannose 
C)  the oxidized form of the Cu2+ reagent 
D)  the oxidized form of the D-mannose 
E)  products in the mixture other than those listed 
A)  the reduced form of the Cu2+ reagent 
B)  the reduced form of the D-mannose 
C)  the oxidized form of the Cu2+ reagent 
D)  the oxidized form of the D-mannose 
E)  products in the mixture other than those listed

Question 6

Which reagent would be best suited for the transformation shown?

Accepted Answer

A)  alkaline Cu2+ in H2O 
B)  Ag+ in H2O/NH3 
C)  H2, with Ni catalyst 
D)  NaNO3 at 0°C 
E)  NaBH4 in H2O 
A)  alkaline Cu2+ in H2O 
B)  Ag+ in H2O/NH3 
C)  H2, with Ni catalyst 
D)  NaNO3 at 0°C 
E)  NaBH4 in H2O

Question 7

Refer to the monosaccharides below to answer the following question(s).
a. Sorbose   b. Rhamnose   c. Erythrulose   d. Xylulose  
-Convert the following Fisher projections into tetrahedral representations.

Accepted Answer

All have t

Question 8

Refer to the sugars below to answer the following question(s). Choose the sugar that best fits each description. There is only one correct answer for each question, but sugars may be used more than once. Indicate each answer by the corresponding letter.

-Draw the structure of the product of the following reaction.

Accepted Answer

The answer of Refer to the sugars below to answer...

Question 9

Refer to the sugars below to answer the following question(s). Choose the sugar that best fits each description. There is only one correct answer for each question, but sugars may be used more than once. Indicate each answer by the corresponding letter.

-Refer to instructions. _____ a ketose and _____ an aldose with two chirality centers

Accepted Answer

A) a 
B) b 
C) c 
D) d 
A) a 
B) b 
C) c 
D) d

Question 10

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

Accepted Answer

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

Question 11

Convert the Fischer projections into tetrahedral representations, and assign R or S stereochemistry to each.
-Describe the fundamental difference between the following classifications of carbohydrates.
a.
monosaccharide, disaccharide, polysaccharide
b.
simple sugar, complex sugar
c.
ketose, aldose
d.
furanose, pyranose

Accepted Answer

a.the number of monosaccharides present

Question 12

Consider the reaction below to answer the following question(s).  
-Refer to instructions. Q and Z are cyclic examples of:

Accepted Answer

A)  acetals 
B)  hemiacetals 
C)  alditols 
D)  hemialditols 
A)  acetals 
B)  hemiacetals 
C)  alditols 
D)  hemialditols

Question 13

Refer to the monosaccharides below to answer the following question(s). Classify each sugar by type; for example, glucose is an aldohexose.a. Sorbose   b. Rhamnose   c. Erythrulose   d. Xylulose  
-Refer to instructions. Erythrulose is ____________________.

Accepted Answer

The answer of Refer to the monosaccharides below to answer...

Question 14

Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question.
-A non-reducing disaccharide

Accepted Answer

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

Question 15

Consider the reaction below to answer the following question(s).  
-Refer to instructions. Compound Z is:

Accepted Answer

A)  the D-anomer. 
B)  the α-anomer. 
C)  the β-anomer. 
D)  the L-anomer. 
A)  the D-anomer. 
B)  the α-anomer. 
C)  the β-anomer. 
D)  the L-anomer.

Question 16

Refer to the equilibrium below to answer the following question(s).  
-Refer to instructions. Classify ribose by carbonyl type and number of carbons.

Accepted Answer

Ribose is

Question 17

Refer to the equilibrium below to answer the following question(s).  
-Refer to instructions. Which enantiomer of ribose is drawn, D or L, and is it the α or β anomer?

Accepted Answer

The answer of Refer to the equilibrium below to answer...

Question 18

Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question.
-A 1,4' β-glycoside

Accepted Answer

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

Question 19

Aldohexoses may exist as furanoses or pyranoses. Aldopentoses also may exist as furanoses or pyranoses.
a)Draw Haworth projections for a furanose and a pyranose obtained from D-ribose.
b)Each product can exist in two anomeric forms. What is the structural difference between these forms?

Accepted Answer

a) @#IMG-DLM& b)The two anomeric forms differ in t

Question 20

The monosaccharide shown below is

Accepted Answer

A)  an aldohexose 
B)  an aldopentose 
C)  an aldotetrose 
D)  a ketohexose 
E)  a ketopentose 
A)  an aldohexose 
B)  an aldopentose 
C)  an aldotetrose 
D)  a ketohexose 
E)  a ketopentose

Exam 21: Biomolecules: Carbohydrates

Consider the reaction below to answer the following question(s). -Refer to instructions. Which anomer is the LEAST stable? Q or Z

Which of the following could not form a pyranose?

Convert the Fischer projections into tetrahedral representations, and assign R or S stereochemistry to each. -Convert and assign:

Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry. β-D-galactopyranose -Draw: Ch3I, Ag2O

The brick-red color observed when Benedict's test is applied to D-mannose is due to

Which reagent would be best suited for the transformation shown?

Refer to the monosaccharides below to answer the following question(s). a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Convert the following Fisher projections into tetrahedral representations.

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

Consider the reaction below to answer the following question(s). -Refer to instructions. Q and Z are cyclic examples of:

Refer to the monosaccharides below to answer the following question(s). Classify each sugar by type; for example, glucose is an aldohexose.a. Sorbose b. Rhamnose c. Erythrulose d. Xylulose -Refer to instructions. Erythrulose is ____________________.

Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question. -A non-reducing disaccharide

Consider the reaction below to answer the following question(s). -Refer to instructions. Compound Z is:

Refer to the equilibrium below to answer the following question(s). -Refer to instructions. Classify ribose by carbonyl type and number of carbons.

Refer to the equilibrium below to answer the following question(s). -Refer to instructions. Which enantiomer of ribose is drawn, D or L, and is it the α or β anomer?

Choose a structure from the list provided below that best fits the description given. There is only one correct answer for each question. -A 1,4' β-glycoside

Aldohexoses may exist as furanoses or pyranoses. Aldopentoses also may exist as furanoses or pyranoses. a)Draw Haworth projections for a furanose and a pyranose obtained from D-ribose. b)Each product can exist in two anomeric forms. What is the structural difference between these forms?

The monosaccharide shown below is

Structure and Bonding

Polar Covalent Bonds; Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

Structure Determination: Mass Spectrometry, Infrared Spectroscopy, and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols, Phenols, and Thiols; Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids, Peptides, and Proteins

Amino Acid Metabolism

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Orbitals and Organic Chemistry: Pericyclic Reactionse

Synthetic Polymerse

Filters

Draw structures for the products you would expect to obtain from reaction of β-D-galactopyranose with the listed reagents. Be sure to include all relevant stereochemistry. β-D-galactopyranose -Draw: Ch₃I, Ag₂O