Question 1

The formation of isopropanol (rubbing alcohol)through the following hydrolysis is known as what type of general reaction?

Accepted Answer

A) oxidation 
B) aromatic substitution 
C) addition reaction 
D) elimination 
E) substitution reaction 
A) oxidation 
B) aromatic substitution 
C) addition reaction 
D) elimination 
E) substitution reaction

Question 2

The alkanes are known for their reactivity.

Accepted Answer

A) True 
 B)False

Question 3

Organic reactions in which atoms or groups that are bonded to adjacent carbon atoms are eliminated are called elimination reactions.

Accepted Answer

A) True 
 B)False

Question 4

Suggest possible compounds for A and B in the following scheme:
CH3CH2I + A → CH3CH2SH + B

Accepted Answer

A) A is HS- and B is I- 
B) A is H2S and B is I2 
C) A is H2S and B is HI 
D) A is S2- and B is I- 
E) A is H2S and B is I- 
A) A is HS- and B is I- 
B) A is H2S and B is I2 
C) A is H2S and B is HI 
D) A is S2- and B is I- 
E) A is H2S and B is I-

Question 5

What is arenium ion?

Accepted Answer

A) a carbocation formed after the electrophilic attack on the benzene ring 
B) a carbocation formed from a molecule containing an arene ring 
C) a carbocation formed during the elimination reaction from an aromatic molecule 
D) a carboanion formed from deprotonation of benzene ring 
E) a carboanion formed after nucleophilic attack on the benzene ring 
A) a carbocation formed after the electrophilic attack on the benzene ring 
B) a carbocation formed from a molecule containing an arene ring 
C) a carbocation formed during the elimination reaction from an aromatic molecule 
D) a carboanion formed from deprotonation of benzene ring 
E) a carboanion formed after nucleophilic attack on the benzene ring

Question 6

Hyperconjugation is best described as:

Accepted Answer

A) an interaction between the orbitals on a substrate and orbitals on a nucleophile 
B) an interaction between σ bonds and π network 
C) a resonance structure with separated charges 
D) an interaction between two π networks 
E) an electrostatic interaction between an electrophile and a nucleophile 
A) an interaction between the orbitals on a substrate and orbitals on a nucleophile 
B) an interaction between σ bonds and π network 
C) a resonance structure with separated charges 
D) an interaction between two π networks 
E) an electrostatic interaction between an electrophile and a nucleophile

Question 7

Write down the rate law for E1 reactions (S is a substrate and B is a base).

Accepted Answer

A) rate = k[S] 
B) rate = k[S][B] 
C) rate = k[B] 
D) rate = k[S]2 
E) rate = k[S]1/2 
A) rate = k[S] 
B) rate = k[S][B] 
C) rate = k[B] 
D) rate = k[S]2 
E) rate = k[S]1/2

Question 8

Identify substituents that are meta directors in electrophilic aromatic substitution.
I.-OR
II.-NO2
III.-OCOCH3
IV.-CHO
V.-COOH

Accepted Answer

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

Question 9

Electrophilic substitution reactions are typical reactions of aromatic compounds.

Accepted Answer

A) True 
 B)False

Question 10

During the nitration of a benzene ring in a mixture of HNO3 and H2SO4 the following species reacts as an electrophile:

Accepted Answer

A) H3O+ 
B) H3SO4+ 
C) H2NO3+ 
D) H+ 
E) NO2+ 
A) H3O+ 
B) H3SO4+ 
C) H2NO3+ 
D) H+ 
E) NO2+

Question 11

What type of polymerization reaction occurred to produce the following polymer?

Accepted Answer

A) step-reaction polymerization 
B) elimination reaction 
C) chain-reaction polymerization 
D) condensation polymerization 
E) propagation polymerization 
A) step-reaction polymerization 
B) elimination reaction 
C) chain-reaction polymerization 
D) condensation polymerization 
E) propagation polymerization

Question 12

Which of the four positions 1-4 marked on the structure of aromatic compound shown below would be preferentially substituted in an electrophilic aromatic substitution reaction?

Accepted Answer

A) 4 only 
B) 2 and 4 
C) 2 only 
D) 1 and 3 
E) 3 only 
A) 4 only 
B) 2 and 4 
C) 2 only 
D) 1 and 3 
E) 3 only

Question 13

The following can be said about the reaction profile of an SN1 reaction:
I.The rate determining step is the formation of a carbocation.
II.The reaction profile has one transition state.
III.The slow step is the first transition state.
IV.The second step is attack of nuleophile on carbocation.
V.The reaction proceeds in a polar aprotic solvent.

Accepted Answer

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

Question 14

What type of polymerization reaction occurred to produce the following polymer?

Accepted Answer

A) addition polymerization 
B) elimination reaction 
C) chain-reaction polymerization 
D) condensation polymerization 
E) propagation polymerization 
A) addition polymerization 
B) elimination reaction 
C) chain-reaction polymerization 
D) condensation polymerization 
E) propagation polymerization

Question 15

Which of the following trends in nucleophilicity are correct?
I.Everything else being equal,a negatively charged nucleophile will react faster than a neutral one.
II.Generally,species containing elements of high electronegativity are good nucleophiles.
III.Anionic nucleophiles are more reactive in polar and aprotic solvents than in polar and protic solvents.
IV.Generally,nucleophilicity is increasing with the increase in size of an atom.
V.Bulky groups adjacent to the nucleophilic atom enhance the nucleophilicity and reactivity of the species.

Accepted Answer

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

Question 16

Which of the following roles can alcohols have in organic reactions?
I.electrophile
II.solvent
III.base
IV.substrate
V.acid

Accepted Answer

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

Question 17

What are the three characteristic steps in a chain-reaction polymerization?

Accepted Answer

A) initiation,elongation and termination 
B) initiation,propagation and termination 
C) racemization,propagation and quenching 
D) propagation,formation and termination 
E) breaking,elongation and quenching 
A) initiation,elongation and termination 
B) initiation,propagation and termination 
C) racemization,propagation and quenching 
D) propagation,formation and termination 
E) breaking,elongation and quenching

Question 18

Which type of polymerization and which monomer(s)would you use to prepare poly(1,4-phenylenediformamide)with the following structure?

Accepted Answer

A)    with chain reaction polymerization 
B)    with condensation polymerization 
C)    with chain reaction polymerization 
D)    with step-reaction polymerization 
E)    with chain reaction polymerization 
A)    with chain reaction polymerization 
B)    with condensation polymerization 
C)    with chain reaction polymerization 
D)    with step-reaction polymerization 
E)    with chain reaction polymerization

Question 19

Which of the following steps would you expect to occur in the addition reaction mechanism?
I.electrophilic attack on the unsaturated bond
II.formation of carboanion
III.formation of carbocation
IV.nucleophilic attack on the carbocation
V.elimination of a base

Accepted Answer

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

Question 20

Which of the following groups is a meta director during electrophilic aromatic substitution?

Accepted Answer

A) -NH2 
B) -OCH3 
C) -Br 
D) -C≡N 
E) -OCOC2H5 
A) -NH2 
B) -OCH3 
C) -Br 
D) -C≡N 
E) -OCOC2H5

Exam 27: Reactions of Organic Compounds

The formation of isopropanol (rubbing alcohol)through the following hydrolysis is known as what type of general reaction?

The alkanes are known for their reactivity.

Organic reactions in which atoms or groups that are bonded to adjacent carbon atoms are eliminated are called elimination reactions.

Suggest possible compounds for A and B in the following scheme: CH3CH2I + A → CH3CH2SH + B

What is arenium ion?

Hyperconjugation is best described as:

Write down the rate law for E1 reactions (S is a substrate and B is a base).

Identify substituents that are meta directors in electrophilic aromatic substitution. I.-OR II.-NO2 III.-OCOCH3 IV.-CHO V.-COOH

Electrophilic substitution reactions are typical reactions of aromatic compounds.

During the nitration of a benzene ring in a mixture of HNO3 and H2SO4 the following species reacts as an electrophile:

What type of polymerization reaction occurred to produce the following polymer?

Which of the four positions 1-4 marked on the structure of aromatic compound shown below would be preferentially substituted in an electrophilic aromatic substitution reaction?

What type of polymerization reaction occurred to produce the following polymer?

Which of the following roles can alcohols have in organic reactions? I.electrophile II.solvent III.base IV.substrate V.acid

What are the three characteristic steps in a chain-reaction polymerization?

Which type of polymerization and which monomer(s)would you use to prepare poly(1,4-phenylenediformamide)with the following structure?

Which of the following steps would you expect to occur in the addition reaction mechanism? I.electrophilic attack on the unsaturated bond II.formation of carboanion III.formation of carbocation IV.nucleophilic attack on the carbocation V.elimination of a base

Which of the following groups is a meta director during electrophilic aromatic substitution?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Chemistry of the Living State

Filters

Suggest possible compounds for A and B in the following scheme: CH₃CH₂I + A → CH₃CH₂SH + B

Identify substituents that are meta directors in electrophilic aromatic substitution. I.-OR II.-NO₂ III.-OCOCH₃ IV.-CHO V.-COOH

During the nitration of a benzene ring in a mixture of HNO₃ and H₂SO₄ the following species reacts as an electrophile: