Question 1

What type of bond cleavage takes place in/what type of intermediate is produced in the following reaction?

Accepted Answer

A)  Homolysis/Radical
B)  Homolysis/Carbocation
C)  Heterolysis/Carbocation
D)  Heterolysis/CarbanionE) All of the above
F) B) and D) C

Question 2

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 B)

Question 3

Which of the following statements is true?

Accepted Answer

A)  Ionic intermediates are formed in radical reactions.
B)  Radicals are intermediates in polar reactions.
C)  Carbocations are electrophiles.
D)  Radicals are nucleophiles.E) B) and C)
F) A) and B)

Question 4

Which of the following statements is true?

Accepted Answer

A)  The size of the activation energy tells us about the reaction mechanism.
B)  The size of the activation energy tells us about the reaction rate.
C)  A slow reaction has low activation energy.
D)  A fast reaction has high activation energy.E) All of the above
F) A) and C)

Question 5

Which of the following statements about substitution reactions is true?

Accepted Answer

A)  Substitution reactions involve π bonds.
B)  Substitution reactions involve σ bonds.
C)  One σ bond breaks and another forms at a different carbon atom.
D)  One π bond breaks and another forms at the same carbon atom.E) A) and B)
F) B) and C)

Question 6

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) All of the above
F) None of the above

Question 7

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

Question 8

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

Accepted Answer

A)  Addition reaction
B)  Substitution reaction
C)  Elimination reaction
D)  Acid-base reactionE) C) and D)
F) B) and D)

Question 9

For which of the following reactions is ΔS° a positive value?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) B) and D)
F) A) and B) A

Question 10

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

Question 11

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

Question 12

Which of the Keq corresponds to the highest value of DG°?

Accepted Answer

A)  Keq = 10-1
B)  Keq = 10-2
C)  Keq = 10-3
D)  Keq = 10-5E) C) and D)
F) A) and B)

Question 13

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

Question 14

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

Question 15

What type of reaction does the following conversion represent?

Accepted Answer

A)  Addition reaction
B)  Elimination reaction
C)  Substitution reaction
D)  Oxidation-reduction reactionE) None of the above
F) All of the above

Question 16

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

Question 17

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

Question 18

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 D)

Question 19

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

Question 20

Which of the following statements about equilibrium is true?

Accepted Answer

A)  Equilibrium favors the products when the energy of the products is higher than the energy of the reactants.
B)  Equilibrium favors the reactants when the energy of the product is lower than the energy of the reactants.
C)  Equilibrium favors the products when they are less stable than the starting material of a reaction.
D)  Equilibrium favors the products when they are more stable than the starting material of a reaction.E) C) and D)
F) B) and D)

Exam 6: Understanding Organic Reactions

What type of bond cleavage takes place in/what type of intermediate is produced in the following reaction?

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Which of the following statements about a catalyst is true?

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Which of the following statements is true?

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Which of the following statements is true?

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Which of the following statements about substitution reactions is true?

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Which of the following statements about bond breaking is 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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What kind of reaction does the conversion of A to B represent?

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For which of the following reactions is ΔS° a positive value?

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

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

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Which of the Keq corresponds to the highest value of DG°?

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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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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 type of reaction does the following conversion represent?

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

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Which of the following statements about enzymes is true?

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

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Which of the following statements about equilibrium is true?

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C

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A

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Which of the K_eq corresponds to the highest value of DG°?

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D

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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