Question 1

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) None of the above

Question 2

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) A) and B)
E) A) and C)

Question 3

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

Accepted Answer

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

Question 4

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 D)
F) A) and C)

Question 5

Using the bond dissociation energies given,calculate DH° for the following reaction.

Accepted Answer

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

Question 6

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: -OCH3 and acetyl chloride were increased 2 times,what would happen to the rate of the reaction? A) Rate would become one-fourth B) Rate would increase 4 times C) Rate would increase 16 times D) Rate would increase 2 times" class="answers-bank-image d-inline" rel="preload" > If the concentrations of both -OCH3 and acetyl chloride were increased 2 times,what would happen to the rate of the reaction?

Accepted Answer

A)  Rate would become one-fourth
B)  Rate would increase 4 times
C)  Rate would increase 16 times
D)  Rate would increase 2 timesE) None of the above
F) B) and C)

Question 7

In which reaction is 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) A) and B)
E) A) and C)

Question 8

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) B) and C)
F) A) and D)

Question 9

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism:  The conversion of acetyl chloride to methyl acetate would be classified as which of the following?

Accepted Answer

A)  Addition
B)  Elimination
C)  Substitution
D)  None of theseE) All of the above
F) A) and D)

Question 10

The equilibrium constant for the conversion of A to D is predicted to be which of the following? eq = 1 B) Keq eq > 1 D) Cannot be determined from the information provided" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Keq = 1
B)  Keq 
C)  Keq > 1
D)  Cannot be determined from the information providedE) A) and B)
F) None of the above

Question 11

Which of the Keq corresponds to the most negative value of DG°?

Accepted Answer

A)  Keq = 1
B)  Keq = 101
C)  Keq = 102
D)  Keq = 103E) A) and B)
F) A) and C)

Question 12

Which of the following statements about addition reactions is true?

Accepted Answer

A)  Two π bonds are formed.
B)  Two π bonds are broken.
C)  Two σ bonds are formed.
D)  One π bond is formed.E) A) and B)
F) All of the above

Question 13

Which reaction is slowest?

Accepted Answer

A)  A
B)  B
C)  CD) A) and B)
E) A) and C)

Question 14

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) C) and D)
F) All of the above

Question 15

Which of the following statements about a catalyst is true?

Accepted Answer

A)  A catalyst accelerates a reaction by changing the amount of reactant and product at equilibrium.
B)  A catalyst accelerates a reaction by lowering the energy of activation.
C)  A catalyst accelerates a reaction by raising the energy of activation.
D)  A catalyst accelerates a reaction by lowering the equilibrium constant.E) All of the above
F) A) and C)

Question 16

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: -OCH3] B) Rate = k [acetyl chloride] C) Rate = k [-OCH3] D) Rate = k [acetyl chloride] [-OCH3]2" class="answers-bank-image d-inline" rel="preload" > What is the rate equation for this reaction if the first step is rate determining?

Accepted Answer

A)  Rate = k [acetyl chloride] [-OCH3]
B)  Rate = k [acetyl chloride]
C)  Rate = k [-OCH3]
D)  Rate = k [acetyl chloride] [-OCH3]2E) A) and D)
F) A) and C)

Question 17

Which of the following statements is not true?

Accepted Answer

A)  Two reactions can have identical values for DH° but very different Ea values.
B)  The larger the activation energy,the slower the reaction.
C)  DH° determines the height of the energy barrier.
D)  The lower the activation energy,the faster the reaction.E) C) and D)
F) A) and B)

Question 18

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) All of the above
F) A) and B)

Question 19

Which of the following statements about enzymes is true?

Accepted Answer

A)  Enzymes increase the activation energy for a reaction.
B)  Enzymes decrease the equilibrium constant.
C)  Enzymes shift the equilibrium to favor the product.
D)  Enzymes lower the transition state for the rate-determining step.E) B) and D)
F) C) and D)

Question 20

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

Accepted Answer

A)  Keq > 1 when DG° > 0
B)  Keq > 1 when DG° 
C)  Keq 
D)  Keq < 1 when DG° = 0E) A) and B)
F) A) and C)

Exam 6: Understanding Organic Reactions

Which of the following statements is not true?

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

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Which of the following statements is true?

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Which of the following statements about addition reactions is true?

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Which of the following statements about a catalyst is true?

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Which reaction is fast and has Keq = 1?

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Which of the Keq corresponds to the most negative value of DG°?

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Which of the following statements about enzymes is true?

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Which of the following statements about bond breaking is true?

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Using the bond dissociation energies given,calculate DH° for the following reaction.

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The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: What is the rate equation for this reaction if the first step is rate determining?

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In which reaction is Keq > 1?

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

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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?

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Which of the following statements is not true?

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

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The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: If the concentrations of both -OCH3 and acetyl chloride were increased 2 times,what would happen to the rate of the reaction?

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The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: The conversion of acetyl chloride to methyl acetate would be classified as which of the following?

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The equilibrium constant for the conversion of A to D is predicted to be which of the following?

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Which reaction is slowest?

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Which reaction is fast and has K_eq= 1?

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Which of the K_eq corresponds to the most negative value of DG°?

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In which reaction is K_eq > 1?

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Which of the following expressions summarizes the correct relationship between the free energy change,DG°,and the equilibrium constant,K_eq?

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The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: If the concentrations of both ^-OCH₃ and acetyl chloride were increased 2 times,what would happen to the rate of the reaction?

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