Question 1

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 2

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 3

Identify the nucleophilic site in the following molecule.

Accepted Answer

SHAPE \* M

Question 4

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 5

Draw the mechanism and most likely product for the following cation rearrangement.

Accepted Answer

The answer of Draw the mechanism and most likely product...

Question 6

Which of the following is the most stable cation?

Accepted Answer

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

Question 7

Predict the sign of ∆S for the following reaction.

Accepted Answer

The answer of Predict the sign of ∆S for the...

Question 8

Which of the following is the most likely structure of the following cation after rearrangement?

Accepted Answer

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

Question 9

Does a reaction with a value of 0 for ∆G favor reactants or products?

Accepted Answer

The answer of Does a reaction with a value of...

Question 10

Will the following cation undergo rearrangement?
SHAPE \* MERGEFORMAT

Accepted Answer

The answer of Will the following cation undergo rearrangement?
SHAPE \*...

Question 11

Does a reaction with a positive ∆S and a positive ∆H favor reactants or products?

Accepted Answer

Cannot det

Question 12

What is an intermediate?

Accepted Answer

A)  A local maximum on the energy diagram. 
B)  A point on the reaction pathway that has a discrete minima. 
C)  A point half-way between the starting materials and products. 
D)  The highest energy compound on an energy diagram. 
A)  A local maximum on the energy diagram. 
B)  A point on the reaction pathway that has a discrete minima. 
C)  A point half-way between the starting materials and products. 
D)  The highest energy compound on an energy diagram.

Question 13

Given the following rate law, what is the order of the reaction with respect to tert-butyl iodide?

Accepted Answer

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

Question 14

Later in the course, we will compare the halogenation of differently substituted carbons, comparing reactions like the ones below. Which of the following statements is true about reactions I and II?

Accepted Answer

A)  Both reactions have a positive heat of reaction (∆Ho) 
B)  Neither reaction has a positive heat of reaction (∆Ho) 
C)  Only reaction I has a positive heat of reaction (∆Ho) 
D)  Only reaction II has a positive heat of reaction (∆Ho) 
A)  Both reactions have a positive heat of reaction (∆Ho) 
B)  Neither reaction has a positive heat of reaction (∆Ho) 
C)  Only reaction I has a positive heat of reaction (∆Ho) 
D)  Only reaction II has a positive heat of reaction (∆Ho)

Question 15

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

Accepted Answer

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

Question 16

Identify the electrophilic site in the following molecule.

Accepted Answer

A)  C 
B)  O 
C)  B 
D)  no electrophilic site 
A)  C 
B)  O 
C)  B 
D)  no electrophilic site

Question 17

Draw an energy diagram for an exothermic three-step reaction.

Accepted Answer

The answer of Draw an energy diagram for an exothermic...

Question 18

Identify the nucleophilic site in the following molecule.

Accepted Answer

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

Question 19

What type of bond cleavage does the following reaction involve?

Accepted Answer

The answer of What type of bond cleavage does the...

Question 20

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

Accepted Answer

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

Exam 6: Chemical Reactivity and Mechanisms

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

Predict the sign of ∆S for the following reaction.

Identify the nucleophilic site in the following molecule.

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

Draw the mechanism and most likely product for the following cation rearrangement.

Which of the following is the most stable cation?

Predict the sign of ∆S for the following reaction.

Which of the following is the most likely structure of the following cation after rearrangement?

Does a reaction with a value of 0 for ∆G favor reactants or products?

Will the following cation undergo rearrangement? SHAPE \* MERGEFORMAT

Does a reaction with a positive ∆S and a positive ∆H favor reactants or products?

What is an intermediate?

Given the following rate law, what is the order of the reaction with respect to tert-butyl iodide?

Later in the course, we will compare the halogenation of differently substituted carbons, comparing reactions like the ones below. Which of the following statements is true about reactions I and II?

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

Identify the electrophilic site in the following molecule.

Draw an energy diagram for an exothermic three-step reaction.

Identify the nucleophilic site in the following molecule.

What type of bond cleavage does the following reaction involve?

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

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

Filters

Will the following cation undergo rearrangement? SHAPE \* MERGEFORMAT $Will the following cation undergo rearrangement? SHAPE \* MERGEFORMAT$ $Will the following cation undergo rearrangement? SHAPE \* MERGEFORMAT$