Question 1

Which compound will not reduce Ag(NH3)2+ ?

Accepted Answer

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

Question 2

Refer to the structures below.Which sugars would react with phenylhydrazine to yield the same phenylosazone?

Accepted Answer

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

Question 3

Which aldohexose would yield an optically active aldaric acid when treated with nitric acid?

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

What is the correct description of this disaccharide?

Accepted Answer

A)  The α-anomer of two D-glucose units joined by an α(1$\rightarrow$4)linkage 
B)  The α-anomer of two D-galactose units joined by an α(1$\rightarrow$4)linkage 
C)  The $\beta$-anomer of two D-galactose units joined by a $\beta$(1$\rightarrow$4)linkage 
D)  The $\beta$-anomer of two D-glucose units joined by a $\beta$(1$\rightarrow$4)linkage 
E)  The α-anomer of two D-galactose units joined by a $\beta$(1$\rightarrow$4)linkage 
A)  The α-anomer of two D-glucose units joined by an α(1$\rightarrow$4)linkage 
B)  The α-anomer of two D-galactose units joined by an α(1$\rightarrow$4)linkage 
C)  The $\beta$-anomer of two D-galactose units joined by a $\beta$(1$\rightarrow$4)linkage 
D)  The $\beta$-anomer of two D-glucose units joined by a $\beta$(1$\rightarrow$4)linkage 
E)  The α-anomer of two D-galactose units joined by a $\beta$(1$\rightarrow$4)linkage

Question 6

Draw the structure of D-mannose in Haworth projection.

Accepted Answer

The answer of Draw the structure of D-mannose in Haworth...

Question 7

Draw the most stable chair conformation of α-D-mannopyranose.

Accepted Answer

The answer of Draw the most stable chair conformation of...

Question 8

A polysaccharide found in the shells of lobsters,crabs,and in the exoskeletons of insects and spiders is called _________.

Accepted Answer

The answer of A polysaccharide found in the shells of...

Question 9

Which compound or compounds would be formed when D-glucose is dissolved in methanol and then treated with anhydrous acid?

Accepted Answer

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

Question 10

A glycoside is a compound which contains the structural features of these classes of organic compounds:

Accepted Answer

A)  Aldehydes and alcohols 
B)  Acetals and alcohols 
C)  Hemiacetals and alcohols 
D)  Ketones and alcohols 
E)  Alcohols and carboxylic acids 
A)  Aldehydes and alcohols 
B)  Acetals and alcohols 
C)  Hemiacetals and alcohols 
D)  Ketones and alcohols 
E)  Alcohols and carboxylic acids

Question 11

Which reagent would be used for the following transformation?

Accepted Answer

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

Question 12

Milk contains a disaccharide called __________.

Accepted Answer

The answer of Milk contains a disaccharide called __________....

Question 13

Consider the structures of D-allose below:   Which of the following structures represents L-allose?

Accepted Answer

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

Question 14

Sugars that would yield the same phenylosazone are:

Accepted Answer

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

Question 15

Carbohydrates that hydrolyze to give a large number of molecules of monosaccharides are called _____________.

Accepted Answer

The answer of Carbohydrates that hydrolyze to give a large...

Question 16

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 17

An optically active hexose,A,C6H12O6,was degraded to an optically active pentose (B),C5H10O5,by the following series of reactions:   Compound (B)was degraded to an optically active tetrose (C)C4H8O4,through the same series of reactions as shown above,then (B)and (C)oxidized with HNO3 to yield the optically active tartaric acid.
Give possible structure for (A)and (B).

Accepted Answer

Question 18

Which of these is a glycoside?

Accepted Answer

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

Question 19

Draw structures for 3 different epimers of D-glucose.

Accepted Answer

The answer of Draw structures for 3 different epimers of...

Question 20

Which would undergo mutarotation in neutral aqueous solution?

Accepted Answer

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

Exam 22: Carbohydrates

Which compound will not reduce Ag(NH3)2+ ?

Refer to the structures below.Which sugars would react with phenylhydrazine to yield the same phenylosazone?

Which aldohexose would yield an optically active aldaric acid when treated with nitric acid?

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

What is the correct description of this disaccharide?

Draw the structure of D-mannose in Haworth projection.

Draw the most stable chair conformation of α-D-mannopyranose.

A polysaccharide found in the shells of lobsters,crabs,and in the exoskeletons of insects and spiders is called _________.

Which compound or compounds would be formed when D-glucose is dissolved in methanol and then treated with anhydrous acid?

A glycoside is a compound which contains the structural features of these classes of organic compounds:

Which reagent would be used for the following transformation?

Milk contains a disaccharide called __________.

Consider the structures of D-allose below: Which of the following structures represents L-allose?

Sugars that would yield the same phenylosazone are:

Carbohydrates that hydrolyze to give a large number of molecules of monosaccharides are called _____________.

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

Which of these is a glycoside?

Draw structures for 3 different epimers of D-glucose.

Which would undergo mutarotation in neutral aqueous solution?

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

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