Question 1

Which compound would have a UV absorption band at longest wavelength?

Accepted Answer

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

Question 2

Which of the following dienes might react with bromine in CCl4 to yield 2,5-dibromo-3-hexene?

Accepted Answer

A)  CH2=CHCH2CH2CH=CH2 
B)  CH2=CHCH=CHCH2CH3 
C)  CH3CH=C=CHCH2CH3 
D)  CH3CH=CHCH=CHCH3 
E)  CH3CH=CHCH2CH=CH2 
A)  CH2=CHCH2CH2CH=CH2 
B)  CH2=CHCH=CHCH2CH3 
C)  CH3CH=C=CHCH2CH3 
D)  CH3CH=CHCH=CHCH3 
E)  CH3CH=CHCH2CH=CH2

Question 3

How could the following synthesis be carried out?

Accepted Answer

A)  (1)Br2/CCl4; (2)CH3MgCl,ether; (3)CH3ONa/CH3OH 
B)  (1)HBr (1 eq); (2)(CH3)2CuLi,ether 
C)  (1)HBr (1eq); (2)Li,ether; (3)CuI; (4)CH3Br 
D)  More than one of the above 
E)  All of the above 
A)  (1)Br2/CCl4; (2)CH3MgCl,ether; (3)CH3ONa/CH3OH 
B)  (1)HBr (1 eq); (2)(CH3)2CuLi,ether 
C)  (1)HBr (1eq); (2)Li,ether; (3)CuI; (4)CH3Br 
D)  More than one of the above 
E)  All of the above

Question 4

Which of the following dienes would you expect to be the most stable?

Accepted Answer

A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3 
A)  CH3CH=CHCH=CHCH3 
B)  CH3CH=CHCH2CH=CH2 
C)  CH2=CHCH2CH2CH=CH2 
D)  CH2=CHCH(CH3)CH=CH2 
E)  CH3CH=C=CHCH2CH3

Question 5

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

Accepted Answer

A)  the less stable product forms more rapidly. 
B)  the more stable product forms more rapidly. 
C)  product B will predominate at equilibrium. 
D)  the intermediate has a short lifetime. 
E)  No conclusions can be drawn as to either reaction rate or product stability. 
A)  the less stable product forms more rapidly. 
B)  the more stable product forms more rapidly. 
C)  product B will predominate at equilibrium. 
D)  the intermediate has a short lifetime. 
E)  No conclusions can be drawn as to either reaction rate or product stability.

Question 6

The LUMO of 1,3-pentadiene has how many electrons in its excited state?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  0 
A)  1 
B)  2 
C)  3 
D)  4 
E)  0

Which compound would have a UV absorption band at longest wavelength?

Which of the following dienes might react with bromine in CCl₄ to yield 2,5-dibromo-3-hexene?

How could the following synthesis be carried out?

Which of the following dienes would you expect to be the most stable?

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

The LUMO of 1,3-pentadiene has how many electrons in its excited state?

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

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

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

Exam 13: Conjugated Unsaturated Systems

Which compound would have a UV absorption band at longest wavelength?

Which of the following dienes might react with bromine in CCl4 to yield 2,5-dibromo-3-hexene?

How could the following synthesis be carried out?

Which of the following dienes would you expect to be the most stable?

The accompanying diagram,which describes the fate of the intermediate in a reversible reaction,implies that:

The LUMO of 1,3-pentadiene has how many electrons in its excited state?

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

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

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

Which of the following dienes might react with bromine in CCl₄ to yield 2,5-dibromo-3-hexene?