Question 1

Which of the following statements is true?

Accepted Answer

A)   Fast reactions have small rate constants.
B)   Slow reactions have large rate constants.
C)   A rate equation contains concentration terms for all reactants involved in a one-step mechanism.
D)   A rate equation contains concentration terms for all the reactants involved in a multi-step reaction.E) A) and B)
F) A) and C)

Question 2

Which of the following statements is not true?

Accepted Answer

A)   In polar reactions, a nucleophile reacts with an electrophile.
B)   Carbocations are electrophiles.
C)   Carbanions are nucleophiles.
D)   A half-headed curved arrow shows the movement of an electron pair.E) A) and C)
F) B) and C)

Question 3

Which of the following statements about bond breaking is not true?

Accepted Answer

A)   Homolysis generates uncharged reactive intermediates with unpaired electrons.
B)   Homolysis require energy but heterolysis does not require energy.
C)   Heterolysis generates charged intermediates.
D)   Heterolysis involves unequal sharing of bonding electrons by atoms.E) A) and D)
F) A) and C)

Question 4

A decrease in which of the following results in an increase in the rate of a chemical reaction?

Accepted Answer

A)   Energy of activation
B)   Concentration
C)   Temperature
D)   Kinetic energyE) B) and C)
F) A) and B)

Question 5

What is the name given to the reaction species that lies at an energy minimum between steps on a reaction energy diagram?

Accepted Answer

A)   Transition state
B)   Activation energy
C)   Reactive intermediate
D)   Equilibrium productE) None of the above
F) B) and C)

Question 6

Which reaction is fast and has Keq= 1? eq= 1?   A)  A B)  B C)  C" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   CD) None of the above
E) All of the above

Question 7

Which of the following expressions summarizes the correct relationship between the free energy change, G°, and the equilibrium constant, Keq?

Accepted Answer

A)   Keq > 1 when G° > 0
B)   Keq > 1 when G° 
C)   Keq G° 
D)   Keq G° = 0E) B) and C)
F) All of the above

Question 8

Which of the following reaction quantities will have an effect on reaction rate?

Accepted Answer

A)   "G°"
B)   "H°"
C)   "Keq"
D)   "Ea"E) A) and D)
F) B) and D)

Question 9

Which of the following statements is not true?

Accepted Answer

A)   Bond breaking is endothermic.
B)   The bond dissociation energy for bond breaking is always negative.
C)   Bond making is exothermic.
D)   The bond dissociation energy for bond formation is always negative.E) A) and C)
F) All of the above B

Question 10

If the conversion of A to B is slow and B to C is fast, what is the rate equation for this reaction? 3) 2CHCl][H2O] B)  Rate = k[(CH3) 2CHCl] C)  Rate = k[(CH3) 2CH]+[H2O] D)  Rate = k[(CH3) 2CH]+" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Rate = k[(CH3) 2CHCl][H2O]
B)   Rate = k[(CH3) 2CHCl]
C)   Rate = k[(CH3) 2CH]+[H2O]
D)   Rate = k[(CH3) 2CH]+E) A) and C)
F) B) and C)

Question 11

The G° (free energy change)  for the conversion of A to B is predicted to be which of the following? G° (free energy change)  for the conversion of A to B is predicted to be which of the following?   A)   G° = 0  B)   G° G° > 0  D)   Cannot be determined from the information provided " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   "G° = 0"
B)   "G° 
C)   "G° > 0"
D)   "Cannot be determined from the information provided"E) None of the above
F) All of the above

Question 12

Which of the following statements about bond breaking is true?

Accepted Answer

A)   Homolysis and heterolysis require energy.
B)   In homolysis, the electrons in the bond are divided unequally.
C)   In heterolysis, the electrons in the bond are divided equally.
D)   Homolysis generates charged intermediates.E) A) and B)
F) A) and C) A

Question 13

How many transition states and intermediates would the reaction profile have for the reaction shown below?

Accepted Answer

A)   Three transition states and three intermediates
B)   Two transition states and two intermediates
C)   Three transition states and two intermediates
D)   Two transition states and three intermediatesE) None of the above
F) A) and B)

Question 14

Which of the Keq corresponds to the highest value of G°?

Accepted Answer

A)   Keq = 10-1
B)   Keq = 10-2
C)   Keq = 10-3
D)   Keq = 10-5E) None of the above
F) A) and D)

Question 15

What kind of reaction does the conversion of A to B represent?

Accepted Answer

A)   Acid-base reaction.
B)   Elimination reaction.
C)   Substitution reaction.
D)   Addition reaction.E) A) and D)
F) All of the above

Question 16

Using the bond dissociation energies given, calculate ?H° for the following reaction.  CH3CH2−Br+H2O⟶CH3CH2−OH++HBr\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } - \mathrm { Br } + \mathrm { H } _ { 2 } \mathrm { O } \longrightarrow \mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } - \mathrm { OH } + + \mathrm { HBr }CH3​CH2​−Br+H2​O⟶CH3​CH2​−OH++HBr  Bond A-B ?H° KJ/mol
CH3CH2-Br
285
H-OH
498
CH3CH2-OH
393
H-Br
368

Accepted Answer

A)   +108 KJ/mol
B)   -130 KJ/mol
C)   -22 KJ/mol
D)   +22 KJ/mol E) C) and D)
F) B) and D)

Question 17

How many transition states are present in the reaction in the energy diagram?

Accepted Answer

A)   0
B)   1
C)   2
D)   3E) A) and D)
F) All of the above

Question 18

Which of the Keq corresponds to the lowest value of G°?

Accepted Answer

A)   "Keq = 10-3"
B)   "Keq = 10-2"
C)   "Keq = 10-1"
D)   "G° cannot be determined"E) B) and C)
F) A) and C)

Question 19

Which of the following statements about elimination reactions is true?

Accepted Answer

A)   Two  bonds are broken.
B)   Two  bonds are formed.
C)   Two  bonds are broken.
D)   Two  bonds are formed.E) A) and B)
F) B) and C)

Question 20

Which of the following letters represents H° for the forward reaction in the following energy diagram? H° for the forward reaction in the following energy diagram?   A)  A B)  B C)  C D)  D" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and B)
F) All of the above D

Exam 6: Understanding Organic Reactions

Which of the following statements is true?

Correct Answer
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Which of the following statements is not true?

Correct Answer
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Which of the following statements about bond breaking is not true?

Correct Answer
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A decrease in which of the following results in an increase in the rate of a chemical reaction?

Correct Answer
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What is the name given to the reaction species that lies at an energy minimum between steps on a reaction energy diagram?

Correct Answer
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Which reaction is fast and has K_eq= 1?

Correct Answer
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Which of the following expressions summarizes the correct relationship between the free energy change, G°, and the equilibrium constant, K_eq?

Correct Answer
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Which of the following reaction quantities will have an effect on reaction rate?

Correct Answer
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Which of the following statements is not true?

Correct Answer
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B

If the conversion of A to B is slow and B to C is fast, what is the rate equation for this reaction?

Correct Answer
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The G° (free energy change) for the conversion of A to B is predicted to be which of the following?

Correct Answer
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Which of the following statements about bond breaking is true?

Correct Answer
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A

How many transition states and intermediates would the reaction profile have for the reaction shown below?

Correct Answer
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Which of the K_eq corresponds to the highest value of G°?

Correct Answer
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What kind of reaction does the conversion of A to B represent?

Correct Answer
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Correct Answer
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How many transition states are present in the reaction in the energy diagram?

Correct Answer
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Which of the K_eq corresponds to the lowest value of G°?

Correct Answer
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Which of the following statements about elimination reactions is true?

Correct Answer
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Which of the following letters represents H° for the forward reaction in the following energy diagram?

Correct Answer
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D

Exam 6: Understanding Organic Reactions

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following statements is not true?

Correct AnswerverifiedShow Answer

Which of the following statements about bond breaking is not true?

Correct AnswerverifiedShow Answer

A decrease in which of the following results in an increase in the rate of a chemical reaction?

Correct AnswerverifiedShow Answer

What is the name given to the reaction species that lies at an energy minimum between steps on a reaction energy diagram?

Correct AnswerverifiedShow Answer

Which reaction is fast and has Keq= 1?

Correct AnswerverifiedShow Answer

Which of the following expressions summarizes the correct relationship between the free energy change, G°, and the equilibrium constant, Keq?

Correct AnswerverifiedShow Answer

Which of the following reaction quantities will have an effect on reaction rate?

Correct AnswerverifiedShow Answer

Which of the following statements is not true?

Correct AnswerverifiedB

If the conversion of A to B is slow and B to C is fast, what is the rate equation for this reaction?

Correct AnswerverifiedShow Answer

The G° (free energy change) for the conversion of A to B is predicted to be which of the following?

Correct AnswerverifiedShow Answer

Which of the following statements about bond breaking is true?

Correct AnswerverifiedA

How many transition states and intermediates would the reaction profile have for the reaction shown below?

Correct AnswerverifiedShow Answer

Which of the Keq corresponds to the highest value of G°?

Correct AnswerverifiedShow Answer

What kind of reaction does the conversion of A to B represent?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How many transition states are present in the reaction in the energy diagram?

Correct AnswerverifiedShow Answer

Which of the Keq corresponds to the lowest value of G°?

Correct AnswerverifiedShow Answer

Which of the following statements about elimination reactions is true?

Correct AnswerverifiedShow Answer

Which of the following letters represents H° for the forward reaction in the following energy diagram?

Correct AnswerverifiedD

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which reaction is fast and has K_eq= 1?

Correct Answer
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Which of the following expressions summarizes the correct relationship between the free energy change, G°, and the equilibrium constant, K_eq?

Correct Answer
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Correct Answer
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Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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A

Correct Answer
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Which of the K_eq corresponds to the highest value of G°?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Which of the K_eq corresponds to the lowest value of G°?

Correct Answer
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Correct Answer
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Correct Answer
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D