Question 1

Rank the following anions from most to least stable, listing the most stable first.

Accepted Answer

A) I> II > III 
B) III > II > I 
C) I > III > II 
D) III > I > II 
A) I> II > III 
B) III > II > I 
C) I > III > II 
D) III > I > II B

Question 2

What is (are) the major product(s) of the following reaction?

Accepted Answer

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

Question 3

What is (are) the major product(s) of the following reaction?

Accepted Answer

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

Question 4

What is the major organic product of the following reaction?

Accepted Answer

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

Question 5

Which of the following is an example of a bridged bicyclic system?

Accepted Answer

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

Question 6

What is the definition of a resonance structure?

Accepted Answer

A) Compounds with the same molecular formula. 
B) Compounds with different carbon frameworks. 
C) Structures that differ only in the placement of π and nonbonding electrons. 
D) Structures that differ only in the location of bonds. 
A) Compounds with the same molecular formula. 
B) Compounds with different carbon frameworks. 
C) Structures that differ only in the placement of π and nonbonding electrons. 
D) Structures that differ only in the location of bonds.

Question 7

What diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

Accepted Answer

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

Question 8

Which of the following statements about the Diels-Alder reaction is true?

Accepted Answer

A) The diene can react only when it adopts the s-trans conformation. 
B) Electron-withdrawing substituents in the diene increase reaction rate. 
C) Electron-donating substituents in the dienophile increase the reaction rate. 
D) The stereochemistry of the dienophile is retained in the product. 
A) The diene can react only when it adopts the s-trans conformation. 
B) Electron-withdrawing substituents in the diene increase reaction rate. 
C) Electron-donating substituents in the dienophile increase the reaction rate. 
D) The stereochemistry of the dienophile is retained in the product.

Question 9

Rank the following dienes in order of increasing reactivity in a Diels-Alder reaction, listing the least reactive first.

Accepted Answer

A) I< II < III 
B) III < I < II 
C) II < I < III 
D) I < III < II 
A) I< II < III 
B) III < I < II 
C) II < I < III 
D) I < III < II

Question 10

Which of the following compounds is the least reactive dienophile in a Diels-Alder reaction?

Accepted Answer

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

Question 11

Which of the following is not a feature of the Diels-Alder reaction?

Accepted Answer

A) They are initiated by peroxides. 
B) They form new six-membered rings. 
C) Three π bonds break. 
D) They are concerted. 
A) They are initiated by peroxides. 
B) They form new six-membered rings. 
C) Three π bonds break. 
D) They are concerted.

Question 12

Which of the following conjugated dienes represent two conformations?

Accepted Answer

A) Only I and II 
B) Only I and III 
C) Only II and III 
D) None of the choices 
A) Only I and II 
B) Only I and III 
C) Only II and III 
D) None of the choices

Question 13

What is the major organic product of the following reaction?

Accepted Answer

A) Only I 
B) Only II 
C) Only III 
D) Only I and II 
A) Only I 
B) Only II 
C) Only III 
D) Only I and II

Question 14

Why would the compound below not react with a dienophile in a Diels-Alder reaction?

Accepted Answer

A) The compound is not a conjugated diene. 
B) There are no electron withdrawing groups on the compound. 
C) There are no electron donating groups on the compound. 
D) The compound cannot adopt the s-cis conformation. 
A) The compound is not a conjugated diene. 
B) There are no electron withdrawing groups on the compound. 
C) There are no electron donating groups on the compound. 
D) The compound cannot adopt the s-cis conformation.

Question 15

Which of the following dienes contain conjugated double bonds?

Accepted Answer

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

Question 16

Which of the following is the least reactive diene in a Diels-Alder reaction?

Accepted Answer

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

Question 17

What is the major organic product of the following reaction?

Accepted Answer

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

Question 18

Which of the following is (are) conjugated dienes?

Accepted Answer

A) Only I 
B) Only II 
C) Only I and II 
D) I, II, and III 
A) Only I 
B) Only II 
C) Only I and II 
D) I, II, and III

Question 19

What is the thermodynamic product obtained from the addition of 1 equivalent of HBr to 1,3-butadiene?

Accepted Answer

A) 3-Bromo-1-butene 
B) 1-Bromo-2-butene 
C) 2-Bromo-2-butene 
D) 2-Bromo-1-butene 
A) 3-Bromo-1-butene 
B) 1-Bromo-2-butene 
C) 2-Bromo-2-butene 
D) 2-Bromo-1-butene

Question 20

What is the major organic product of the following reaction?

Accepted Answer

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

Exam 16: Conjugation, Resonance, and Dienes

Rank the following anions from most to least stable, listing the most stable first.

What is (are) the major product(s) of the following reaction?

What is (are) the major product(s) of the following reaction?

What is the major organic product of the following reaction?

Which of the following is an example of a bridged bicyclic system?

What is the definition of a resonance structure?

What diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

Which of the following statements about the Diels-Alder reaction is true?

Rank the following dienes in order of increasing reactivity in a Diels-Alder reaction, listing the least reactive first.

Which of the following compounds is the least reactive dienophile in a Diels-Alder reaction?

Which of the following is not a feature of the Diels-Alder reaction?

Which of the following conjugated dienes represent two conformations?

What is the major organic product of the following reaction?

Why would the compound below not react with a dienophile in a Diels-Alder reaction?

Which of the following dienes contain conjugated double bonds?

Which of the following is the least reactive diene in a Diels-Alder reaction?

What is the major organic product of the following reaction?

Which of the following is (are) conjugated dienes?

What is the thermodynamic product obtained from the addition of 1 equivalent of HBr to 1,3-butadiene?

What is the major organic product of the following reaction?

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Understanding Organic Reactions

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers, and Related Compounds

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry;

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Filters