Question 1

Which of the following statements is true?

Accepted Answer

A)   The product is favored in reaction in which H° is a positive value.
B)   Entropy decreases when an acyclic compound forms a ring.
C)   In homolytic bond cleavage, entropy decreases and favors formation of products.
D)   The starting material is favored in a reaction in which H° is a negative value.E) C) and D)
F) B) and D)

Question 2

Which compound would you predict to be highest in energy?

Accepted Answer

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

Question 3

Which of the Keq corresponds to the most negative value of G°?

Accepted Answer

A)   Keq = 1
B)   Keq = 101
C)   Keq = 102
D)   Keq = 103E) A) and D)
F) All of the above

Question 4

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) None of the above
F) A) and B)

Question 5

Which of the following statements about addition reactions is true?

Accepted Answer

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

Question 6

Which of the following statements about substitution reactions is true?

Accepted Answer

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

Question 7

Which of the following statements about the equilibrium constant, Keq, is true?

Accepted Answer

A)   When Keq > 1, the equilibrium favors the reactants.
B)   When Keq 
C)   The size of Keq tells about the position of equilibrium.
D)   For a reaction to be useful, the equilibrium must favor the reactants.E) All of the above
F) None of the above

Question 8

Which of the following statements is true?

Accepted Answer

A)   Bond dissociation energies increase down a column of the periodic table.
B)   When H° is positive, more energy is released in forming bonds than is needed to break bonds.
C)   When H° is negative, more energy is needed to break bonds than is released in forming bonds.
D)   Bond dissociation energies decrease down a column of the periodic table.E) A) and C)
F) A) and D)

Question 9

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 large activation energy.E) B) and C)
F) None of the above

Question 10

Which step would most likely have the largest energy of activation?

Accepted Answer

A)   Step one
B)   Step two
C)   Step three
D)   It cannot be determined from the information providedE) C) and D)
F) None of the above

Question 11

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

Accepted Answer

A)   Addition reaction
B)   Substitution reaction
C)   Elimination reaction
D)   Oxidation-reduction reactionE) All of the above
F) A) and B)

Question 12

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) None of the above
E) A) and B)

Question 13

Which of the following statements is not true?

Accepted Answer

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

Question 14

Using the bond dissociation energies given, calculate ?H° for the following reaction.  (CH3) 3CCl+H2O⟶(CH3) 3COH+HCl+\left( \mathrm { CH } _ { 3 } \right)  _ { 3 } \mathrm { CCl } + \mathrm { H } _ { 2 } \mathrm { O } \longrightarrow \left( \mathrm { CH } _ { 3 } \right)  _ { 3 } \mathrm { COH } + \mathrm { HCl } ^ { + }(CH3​) 3​CCl+H2​O⟶(CH3​) 3​COH+HCl+  Bond A-B ?H° KJ/mol
(CH3) 3C-Cl
331
H-OH
498
(CH3) 3C-OH
401
H-Cl
431

Accepted Answer

A)   +3 KJ/mol
B)   -3 KJ/mol
C)   -67 KJ/mol
D)   +70 KJ/mol E) A) and D)
F) All of the above

Question 15

Which reaction is slowest?

Accepted Answer

A)   A
B)   B
C)   CD) A) and B)
E) All of the above

Question 16

Which reaction has a positive G°, assuming that entropy changes are negligible compared to enthalpy changes? G°, assuming that entropy changes are negligible compared to enthalpy changes?   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) B) and C)

Question 17

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

Question 18

Which of the following statements about a two-step reaction mechanism is true?

Accepted Answer

A)   The transition states are located at energy minima.
B)   Each step is characterized by its own value of H° and Ea.
C)   The rate-determining step has the lower energy transition state.
D)   The reactive intermediate is located at an energy maximum.E) A) and B)
F) B) and D)

Question 19

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

Question 20

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

Exam 6: Understanding Organic Reactions

Which of the following statements is not true?

Correct Answer
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Which reaction is slowest?

Correct Answer
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Correct Answer
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Which of the following statements about a two-step reaction mechanism is true?

Correct Answer
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Which of the following statements is true?

Correct Answer
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Which of the following statements about equilibrium is true?

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

Correct Answer
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Which reaction has a positive G°, assuming that entropy changes are negligible compared to enthalpy changes?

Correct Answer
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Which of the following statements is true?

Correct Answer
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Which step would most likely have the largest energy of activation?

Correct Answer
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Which of the following statements is true?

Correct Answer
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Which of the following statements about a catalyst is true?

Correct Answer
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In which reaction is K_eq > 1?

Correct Answer
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Which of the following statements about enzymes is true?

Correct Answer
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Which compound would you predict to be highest in energy?

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

Correct Answer
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Which of the following statements about the equilibrium constant, K_eq, is true?

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

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

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

Correct Answer
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Exam 6: Understanding Organic Reactions

Which of the following statements is not true?

Correct AnswerverifiedShow Answer

Which reaction is slowest?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following statements about a two-step reaction mechanism is true?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following statements about equilibrium is true?

Correct AnswerverifiedShow Answer

Which of the following statements about substitution reactions is true?

Correct AnswerverifiedShow Answer

Which reaction has a positive G°, assuming that entropy changes are negligible compared to enthalpy changes?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which step would most likely have the largest energy of activation?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following statements about a catalyst is true?

Correct AnswerverifiedShow Answer

In which reaction is Keq > 1?

Correct AnswerverifiedShow Answer

Which of the following statements about enzymes is true?

Correct AnswerverifiedShow Answer

Which compound would you predict to be highest in energy?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements about the equilibrium constant, Keq, is true?

Correct AnswerverifiedShow Answer

Which of the Keq corresponds to the most negative value of G°?

Correct AnswerverifiedShow Answer

Which of the following statements about addition reactions is true?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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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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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Correct Answer
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Correct Answer
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In which reaction is K_eq > 1?

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 following statements about the equilibrium constant, K_eq, is true?

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

Correct Answer
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Correct Answer
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Correct Answer
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