Question 1

What is the energy of activation for the following reaction?

Accepted Answer

The answer of What is the energy of activation for...

Question 2

Identify the electrophilic site in the following molecule.

Accepted Answer

The answer of Identify the electrophilic site in the following...

Question 3

For the following reaction step, indicate which pattern of arrow pushing it represents.

Accepted Answer

A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement 
A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement

Question 4

Predict the sign of ∆G for an endothermic reaction with a decrease in entropy.

Accepted Answer

A)  positive 
B)  negative 
C)  no change 
D)  cannot predict without additional information 
A)  positive 
B)  negative 
C)  no change 
D)  cannot predict without additional information

Question 5

Identify the arrow in the following equation.

Accepted Answer

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

Question 6

Does a reaction with a ∆H of 14 kJ/mol and a ∆S of 150 J/mol·K at 298 K favor reactants or products?

Accepted Answer

The answer of Does a reaction with a ∆H of...

Question 7

For the following reaction step, indicate which pattern of arrow pushing it represents.

Accepted Answer

A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement 
A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement

Question 8

Given the following rate law, what is the order of the reaction with respect to MeI?

Accepted Answer

The answer of Given the following rate law, what is...

Question 9

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Accepted Answer

The answer of Using Table 6.1, estimate the enthalpy change...

Question 10

Which of the following is an energy diagram for a two-step reaction?

Accepted Answer

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

Question 11

What is wrong with the following mechanism?

Accepted Answer

A)  There is no leaving group, so there should be no arrows. 
B)  The arrow should be removing a proton from the H2O group. 
C)  An arrow is also needed to indicate the loss of the leaving group. 
D)  The arrow indicating the formation of the C-Br bond (nucleophilic attack) should start at the bromide anion. 
A)  There is no leaving group, so there should be no arrows. 
B)  The arrow should be removing a proton from the H2O group. 
C)  An arrow is also needed to indicate the loss of the leaving group. 
D)  The arrow indicating the formation of the C-Br bond (nucleophilic attack) should start at the bromide anion.

Question 12

What pattern of curved arrow pushing is the fourth step of this reaction?

Accepted Answer

A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement 
A)  proton transfer 
B)  loss of leaving group 
C)  nucleophilic attack 
D)  rearrangement

Question 13

Predict the sign of ∆S for the following reaction.

Accepted Answer

A)  positive 
B)  negative 
C)  no change 
A)  positive 
B)  negative 
C)  no change

Question 14

Will the following cation undergo rearrangement?

Accepted Answer

The answer of Will the following cation undergo rearrangement? ...

Question 15

Identify the sequence of curved arrows (electron movement) in the steps of the following reaction.

Accepted Answer

A)  proton transfer, proton transfer 
B)  proton transfer, loss of leaving group 
C)  nucleophilic attack, proton transfer 
D)  proton transfer, nucleophilic attack 
A)  proton transfer, proton transfer 
B)  proton transfer, loss of leaving group 
C)  nucleophilic attack, proton transfer 
D)  proton transfer, nucleophilic attack

Question 16

You are working in a research laboratory and have developed a new reagent that cleaves C-H bonds homolytically. Unfortunately, this reagent can achieve only one of the transformations shown below. In light of bond dissociation energies, which transformation is most likely to be achieved?

Accepted Answer

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

Question 17

Using Table 6.1, which of the following is the enthalpy change of the following reaction under standard conditions?

Accepted Answer

A)  -21 kJ/mol 
B)  +21 kJ/mol 
C)  -171 kJ/mol 
D)  +171 kJ/mol 
A)  -21 kJ/mol 
B)  +21 kJ/mol 
C)  -171 kJ/mol 
D)  +171 kJ/mol

Question 18

Predict the sign of ∆G for an endothermic reaction with an increase in entropy.

Accepted Answer

A)  positive 
B)  negative 
C)  no change 
D)  cannot predict without additional information 
A)  positive 
B)  negative 
C)  no change 
D)  cannot predict without additional information

Question 19

What type of bond cleavage does the following reaction involve?

Accepted Answer

A)  homolytic 
B)  heterolytic 
C)  covalent 
D)  ionic 
A)  homolytic 
B)  heterolytic 
C)  covalent 
D)  ionic

Question 20

Will the following cation undergo rearrangement?

Accepted Answer

The answer of Will the following cation undergo rearrangement? ...

Exam 6: Chemical Reactivity and Mechanisms

What is the energy of activation for the following reaction?

Identify the electrophilic site in the following molecule.

For the following reaction step, indicate which pattern of arrow pushing it represents.

Predict the sign of ∆G for an endothermic reaction with a decrease in entropy.

Identify the arrow in the following equation.

Does a reaction with a ∆H of 14 kJ/mol and a ∆S of 150 J/mol·K at 298 K favor reactants or products?

For the following reaction step, indicate which pattern of arrow pushing it represents.

Given the following rate law, what is the order of the reaction with respect to MeI?

Using Table 6.1, estimate the enthalpy change of the following reaction under standard conditions.

Which of the following is an energy diagram for a two-step reaction?

What is wrong with the following mechanism?

What pattern of curved arrow pushing is the fourth step of this reaction?

Predict the sign of ∆S for the following reaction.

Will the following cation undergo rearrangement?

Identify the sequence of curved arrows (electron movement) in the steps of the following reaction.

You are working in a research laboratory and have developed a new reagent that cleaves C-H bonds homolytically. Unfortunately, this reagent can achieve only one of the transformations shown below. In light of bond dissociation energies, which transformation is most likely to be achieved?

Using Table 6.1, which of the following is the enthalpy change of the following reaction under standard conditions?

Predict the sign of ∆G for an endothermic reaction with an increase in entropy.

What type of bond cleavage does the following reaction involve?

Will the following cation undergo rearrangement?

A Review of General Chemistry: Electrons, Bonds, and Molecular Properties

Molecular Representations

Acids and Bases

Alkanes and Cycloalkanes

Stereoisomerism

Alkyl Halides: Nucleophilic Substitution and Elimination Reactions

Addition Reactions of Alkenes

Alkynes

Radical Reactions

Synthesis

Alcohols and Phenols

Ethers and Epoxides; Thiols and Sulfides

Infrared Spectroscopy and Mass Spectrometry

Nuclear Magnetic Resonance Spectroscopy

Conjugated Pi Systems and Pericyclic Reactions

Aromatic Compounds

Aromatic Substitution Reactions

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Alpha Carbon Chemistry: Enols and Enolates

Amines

Introduction to Organometallic Compounds

Carbohydrates

Amino Acids, Peptides, and Proteins

Lipids

Synthetic Polymers

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