Question 1

Which reagents would you choose to carry out the following transformations?
I. 
II.  
III.

Accepted Answer

A) Reaction I use KOtBu 
Reaction II use MeOH
Reaction III use NaOCH(CH3)2 
B) Reaction I use NaOMe 
Reaction II use MeOH
Reaction III use NaOC(CH3)3 
C) Reaction I use NaOMe 
Reaction II use MeOH
Reaction III use NaOMe 
D) Reaction I use KOtBu 
Reaction II use HC(=O)H
Reaction III use NaOCH(CH3)2 
E) Reaction I use KOtBu 
Reaction II use Na2Cr2O7 or K2Cr2O7
Reaction III use NaOCH(CH3)2 
A) Reaction I use KOtBu 
Reaction II use MeOH
Reaction III use NaOCH(CH3)2 
B) Reaction I use NaOMe 
Reaction II use MeOH
Reaction III use NaOC(CH3)3 
C) Reaction I use NaOMe 
Reaction II use MeOH
Reaction III use NaOMe 
D) Reaction I use KOtBu 
Reaction II use HC(=O)H
Reaction III use NaOCH(CH3)2 
E) Reaction I use KOtBu 
Reaction II use Na2Cr2O7 or K2Cr2O7
Reaction III use NaOCH(CH3)2

Question 2

Finish the sentence:
"Elimination reactions...

Accepted Answer

A) ...can follow two different mechanisms." 
B) ...do not compete with other reaction types." 
C) ...usually give a saturated product." 
D) ...always give only one product." 
E) ...have only one mechanistic path." 
A) ...can follow two different mechanisms." 
B) ...do not compete with other reaction types." 
C) ...usually give a saturated product." 
D) ...always give only one product." 
E) ...have only one mechanistic path."

Question 3

Synthesis of alkanes from alkyl halides is a typical example of E2 reaction.

Accepted Answer

A) True 
 B)False

Question 4

Which of the following are nucleophiles?
I.CH3COCH3 
II.CH3Br 
III.CH3CH2C≡C-

Accepted Answer

A) I 
B) II 
C) III 
D) I + II 
E) I + III 
A) I 
B) II 
C) III 
D) I + II 
E) I + III

Question 5

SN2 reactions are nucleophilic substitution reactions for which the rate determining step is bimolecular.

Accepted Answer

A) True 
 B)False

Question 6

When (CH3)3CBr reacts with CH3ONa in methanol,two products are formed: a major one is an alkene and minor one is an ether.Identify the two products and by what mechanism(s)they are formed?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 7

Predict major products for chlorination of the following three aromatic compounds:

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 8

Predict the major product for the reaction: 
1-butene + HI →

Accepted Answer

A) CH2ICH2CH2CH3  
B) CH2ICH=CHCH3  
C) CH2=CICH2CH3  
D) CH3CHICH2CH3  
E) CH3CI2CH2CH3  
A) CH2ICH2CH2CH3  
B) CH2ICH=CHCH3  
C) CH2=CICH2CH3  
D) CH3CHICH2CH3  
E) CH3CI2CH2CH3

Question 9

Classify the following reaction steps as initiation,propagation or termination.
A: Br-Br → 2 Br∙
B: H3CH2C∙ + Br∙ → CH3CH2Br
C: 2 H3CH2C∙ → CH3CH2CH2CH3

Accepted Answer

A) Step A is initiation and steps B and C are propagation 
B) Steps A and B are initiation and step C is termination 
C) Step A is initiation,step B is termination and step C is propagation 
D) Step A is initiation,step B is propagation and step C is termination 
E) Step A is initiation and steps B and C are termination 
A) Step A is initiation and steps B and C are propagation 
B) Steps A and B are initiation and step C is termination 
C) Step A is initiation,step B is termination and step C is propagation 
D) Step A is initiation,step B is propagation and step C is termination 
E) Step A is initiation and steps B and C are termination

Question 10

Complete the following reaction: NH3 + CH3Br →

Accepted Answer

A) CH4 + NH2Br 
B) CH2=NH + H2 + HBr 
C) CH3NH2 + NH4+Br-  
D) CH3NH3+Br-  
E) There is no reaction. 
A) CH4 + NH2Br 
B) CH2=NH + H2 + HBr 
C) CH3NH2 + NH4+Br-  
D) CH3NH3+Br-  
E) There is no reaction.

Question 11

Identify the product for the following reaction:

Accepted Answer

A) 3-methyl-1-pentene 
B) 3-methyl-2-pentene 
C) 3-methyl-1-pentane 
D) 3-methyl-1-tert-butylpentante 
E) 3-methylpentane 
A) 3-methyl-1-pentene 
B) 3-methyl-2-pentene 
C) 3-methyl-1-pentane 
D) 3-methyl-1-tert-butylpentante 
E) 3-methylpentane

Question 12

Which of the following steps can be found in any of the polymerization mechanisms you learned?
I.initiation
II.condensation
III.propagation
IV.dehydrohalogenation
V.rearrangement

Accepted Answer

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

Question 13

Which of the following groups would be ortho,para directors in electrophilic aromatic substitution?
I.-CN
II.-SO3H
III.-NH2
IV.-OH
V.-Br

Accepted Answer

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

Question 14

The rate of E2 reaction between an alkyl halide RX and a base B is given by the following expression (k is a rate constant):

Accepted Answer

A) k[RX] 
B) k[B] 
C) k[RX][B] 
D) k[RX]2 
E) k[RX]2[B] 
A) k[RX] 
B) k[B] 
C) k[RX][B] 
D) k[RX]2 
E) k[RX]2[B]

Exam 27: Reactions of Organic Compounds

Which reagents would you choose to carry out the following transformations? I. II. III.

Finish the sentence: "Elimination reactions...

Synthesis of alkanes from alkyl halides is a typical example of E2 reaction.

Which of the following are nucleophiles? I.CH3COCH3 II.CH3Br III.CH3CH2C≡C-

SN2 reactions are nucleophilic substitution reactions for which the rate determining step is bimolecular.

When (CH3)3CBr reacts with CH3ONa in methanol,two products are formed: a major one is an alkene and minor one is an ether.Identify the two products and by what mechanism(s)they are formed?

Predict major products for chlorination of the following three aromatic compounds:

Predict the major product for the reaction: 1-butene + HI →

Classify the following reaction steps as initiation,propagation or termination. A: Br-Br → 2 Br∙ B: H3CH2C∙ + Br∙ → CH3CH2Br C: 2 H3CH2C∙ → CH3CH2CH2CH3

Complete the following reaction: NH3 + CH3Br →

Identify the product for the following reaction:

Which of the following steps can be found in any of the polymerization mechanisms you learned? I.initiation II.condensation III.propagation IV.dehydrohalogenation V.rearrangement

Which of the following groups would be ortho,para directors in electrophilic aromatic substitution? I.-CN II.-SO3H III.-NH2 IV.-OH V.-Br

The rate of E2 reaction between an alkyl halide RX and a base B is given by the following expression (k is a rate constant):

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

Which of the following are nucleophiles? I.CH₃COCH₃ II.CH₃Br III.CH₃CH₂C≡C^-

S_N2 reactions are nucleophilic substitution reactions for which the rate determining step is bimolecular.

When (CH₃)₃CBr reacts with CH₃ONa in methanol,two products are formed: a major one is an alkene and minor one is an ether.Identify the two products and by what mechanism(s)they are formed?

Classify the following reaction steps as initiation,propagation or termination. A: Br-Br → 2 Br∙ B: H₃CH₂C∙ + Br∙ → CH₃CH₂Br C: 2 H₃CH₂C∙ → CH₃CH₂CH₂CH₃

Complete the following reaction: NH₃ + CH₃Br →

Which of the following groups would be ortho,para directors in electrophilic aromatic substitution? I.-CN II.-SO₃H III.-NH₂ IV.-OH V.-Br