Question 1

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 reaction

Question 2

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 reaction.

Question 3

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.

Question 4

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.

Question 5

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 DH° and Ea.
C)  The rate-determining step has the lower energy transition state.
D)  The reactive intermediate is located at an energy maximum.

Question 6

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

Accepted Answer

A)  DG°
B)  DH°
C)  Keq
D)  Ea

Question 7

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.

Question 8

Calculate Ea for the conversion of C B. a for the conversion of C B.   A) +3 kcal B) +7 kcal C) +9 kcal D) None of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  +3 kcal
B)  +7 kcal
C)  +9 kcal
D)  None of these C

Question 9

Which compound would you predict to be highest in energy?

Accepted Answer

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

Question 10

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.

Question 11

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 energy

Question 12

Which of the following statements is true?

Accepted Answer

A)  The product is favored in reaction in which DH° 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 DH° is a negative value.

Question 13

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.

Question 14

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 intermediates

Question 15

Which reaction is slowest?

Accepted Answer

A)  A
B)  B
C)  C A

Question 16

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 times

Question 17

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

Accepted Answer

A)  A
B)  B
C)  C

Question 18

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.

Question 19

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. B

Question 20

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/mol

Exam 6: Understanding Organic Reactions

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

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

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Which of the following statements about addition reactions is true?

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Which of the following statements is true?

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

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

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

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Calculate Ea for the conversion of C B.

Correct AnswerverifiedC

Which compound would you predict to be highest in energy?

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Which of the following statements about a catalyst is true?

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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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Which of the following statements is true?

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

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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 reaction is slowest?

Correct AnswerverifiedA

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?

Correct AnswerverifiedShow Answer

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

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Which of the following statements about substitution reactions is true?

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Which of the following statements is not true?

Correct AnswerverifiedB

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

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Calculate E_a for the conversion of C B.

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C

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

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A

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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B

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