Question 1

Which of the following statements about kinetic vs.thermodynamic products is true?

Accepted Answer

A) The product that is formed faster is the thermodynamic product. 
B) The kinetic product predominates at low temperature. 
C) The product that predominates at equilibrium is the kinetic product. 
D) The thermodynamic product is less stable. 
A) The product that is formed faster is the thermodynamic product. 
B) The kinetic product predominates at low temperature. 
C) The product that predominates at equilibrium is the kinetic product. 
D) The thermodynamic product is less stable. B

Question 2

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 C

Question 3

Which of the following compound absorbs UV light at the longest wavelength?

Accepted Answer

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

Question 4

How would you favor the formation of the kinetic product of the following reaction?

Accepted Answer

A) Excess HBr 
B) Long reaction time 
C) Low temperature 
D) High pressure 
A) Excess HBr 
B) Long reaction time 
C) Low temperature 
D) High pressure

Question 5

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 6

What is the kinetic 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 7

Which of the following is not a product obtained from the addition of 1 equivalent of HBr to (E)-1,3-pentadiene?

Accepted Answer

A) (
E) -4-Bromo-2-pentene 
B) (
E) -1-Bromo-2-pentene 
C) 3-Bromo-1-pentene 
D) (
E) -3-Bromo-2-pentene 
A) (
E) -4-Bromo-2-pentene 
B) (
E) -1-Bromo-2-pentene 
C) 3-Bromo-1-pentene 
D) (
E) -3-Bromo-2-pentene

Question 8

Which of the following is the most 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 9

What is the reactive intermediate in the reaction of 1,3-diene with HBr,resulting in 1,4-addition?

Accepted Answer

A) Allylic radical 
B) Cyclic bromonium 
C) Dienophile 
D) Allylic carbocation 
A) Allylic radical 
B) Cyclic bromonium 
C) Dienophile 
D) Allylic carbocation

Question 10

Which triene absorbs the longest wavelength of UV light?

Accepted Answer

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

Question 11

What is the hybridization around the indicated carbon atom in the following anion?

Accepted Answer

A) sp3 
B) sp2 
C) sp 
D) p 
A) sp3 
B) sp2 
C) sp 
D) p

Question 12

Rank the following compounds in order of increasing stability,putting the least stable first.

Accepted Answer

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

Question 13

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 14

What is the major product of the following reaction?

Accepted Answer

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

Question 15

Which of the following statements about resonance structures is true?

Accepted Answer

A) The placement of atoms is different. 
B) The placement of p bonds is different. 
C) The placement of s bonds is different. 
D) The placement of nonbonded electrons is the same. 
A) The placement of atoms is different. 
B) The placement of p bonds is different. 
C) The placement of s bonds is different. 
D) The placement of nonbonded electrons is the same.

Question 16

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 17

Which of the following compound absorbs UV light at the longest wavelength?

Accepted Answer

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

Question 18

Which of the following electronic transitions is common in the UV spectrum of 1,3-butadiene?

Accepted Answer

A) s®p 
B) s®p* 
C) n ®p* 
D) p®p* 
A) s®p 
B) s®p* 
C) n ®p* 
D) p®p*

Question 19

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 20

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

Exam 14: Conjugation,resonance,and Dienes

Which of the following statements about kinetic vs.thermodynamic products is true?

What is the definition of a resonance structure?

Which of the following compound absorbs UV light at the longest wavelength?

How would you favor the formation of the kinetic product of the following reaction?

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

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

Which of the following is not a product obtained from the addition of 1 equivalent of HBr to (E)-1,3-pentadiene?

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

What is the reactive intermediate in the reaction of 1,3-diene with HBr,resulting in 1,4-addition?

Which triene absorbs the longest wavelength of UV light?

What is the hybridization around the indicated carbon atom in the following anion?

Rank the following compounds in order of increasing stability,putting the least stable first.

What is the major organic product of the following reaction?

What is the major product of the following reaction?

Which of the following statements about resonance structures is true?

Which of the following is (are)conjugated dienes?

Which of the following compound absorbs UV light at the longest wavelength?

Which of the following electronic transitions is common in the UV spectrum of 1,3-butadiene?

Which of the following dienes contain conjugated double bonds?

What is (are)the major product(s)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 and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Spectroscopy A: Mass Spectrometry

Spectroscopy B: Infrared Spectroscopy

Spectroscopy C: Nuclear Magnetic Resonance Spectroscopy

Filters