Question 1

In which reaction is Keq > 1?

Accepted Answer

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

Question 2

Which reaction has a positive F1F1F1S1F1F1F10G°, assuming that entropy changes are negligible compared to enthalpy changes?

Accepted Answer

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

Question 3

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. 
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.

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 large activation energy. 
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.

Question 5

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 eq tells about the position of equilibrium. 
D)  For a reaction to be useful, the equilibrium must favor the reactants. 
A)  When Keq > 1, the equilibrium favors the reactants. 
B)  When Keq eq tells about the position of equilibrium. 
D)  For a reaction to be useful, the equilibrium must favor the reactants.

Question 6

Using the bond dissociation energies given, calculate F1F1F1S1?F1F1F10H° for the following reaction. $$\left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { CCl } + \mathrm { H } _ { 2 } \mathrm { O } \longrightarrow \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { COH } + \mathrm { HCl } ^ { + }$$ Bond A-B F1F1F1S1?F1F1F10H° 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 
A)  +3 KJ/mol 
B)  -3 KJ/mol 
C)  -67 KJ/mol 
D)  +70 KJ/mol

Question 7

Which of the following statements is not true?

Accepted Answer

A)  "Two reactions can have identical values for F1F1F1S1F1F1F10H° but very different Ea values." 
B)  "The larger the activation energy, the slower the reaction." 
C)  "F1F1F1S1F1F1F10H° determines the height of the energy barrier." 
D)  "The lower the activation energy, the faster the reaction." 
A)  "Two reactions can have identical values for F1F1F1S1F1F1F10H° but very different Ea values." 
B)  "The larger the activation energy, the slower the reaction." 
C)  "F1F1F1S1F1F1F10H° determines the height of the energy barrier." 
D)  "The lower the activation energy, the faster the reaction."

Question 8

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

Accepted Answer

A)  Keq = 1 
B)  Keq eq > 1 
D)  Cannot be determined from the information provided 
A)  Keq = 1 
B)  Keq eq > 1 
D)  Cannot be determined from the information provided

Question 9

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 
A)  Addition reaction 
B)  Substitution reaction 
C)  Elimination reaction 
D)  Oxidation-reduction reaction

Question 10

Which reaction is slowest?

Accepted Answer

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

Question 11

Which of the following statements is true?

Accepted Answer

A)  Bond dissociation energies increase down a column of the periodic table. 
B)  When F1F1F1S1F1F1F10H° is positive, more energy is released in forming bonds than is needed to break bonds. 
C)  When F1F1F1S1F1F1F10H° 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. 
A)  Bond dissociation energies increase down a column of the periodic table. 
B)  When F1F1F1S1F1F1F10H° is positive, more energy is released in forming bonds than is needed to break bonds. 
C)  When F1F1F1S1F1F1F10H° 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.

Question 12

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. 
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 13

Which compound would you predict to be highest in energy?

Accepted Answer

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

Question 14

Which of the following statements about substitution reactions is true?

Accepted Answer

A)  Substitution reactions involve F1F1F1S1F1F1F10 bonds. 
B)  Substitution reactions involve F1F1F1S1F1F1F10 bonds. 
C)  One F1F1F1S1F1F1F10 bond breaks and another forms at a different carbon atom. 
D)  One F1F1F1S1F1F1F10 bond breaks and another forms at the same carbon atom. 
A)  Substitution reactions involve F1F1F1S1F1F1F10 bonds. 
B)  Substitution reactions involve F1F1F1S1F1F1F10 bonds. 
C)  One F1F1F1S1F1F1F10 bond breaks and another forms at a different carbon atom. 
D)  One F1F1F1S1F1F1F10 bond breaks and another forms at the same carbon atom.

Question 15

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 F1F1F1S1F1F1F10H° and Ea. 
C)  The rate-determining step has the lower energy transition state. 
D)  The reactive intermediate is located at an energy maximum. 
A)  The transition states are located at energy minima. 
B)  Each step is characterized by its own value of F1F1F1S1F1F1F10H° and Ea. 
C)  The rate-determining step has the lower energy transition state. 
D)  The reactive intermediate is located at an energy maximum.

Question 16

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. 
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.

Question 17

Which of the following statements about addition reactions is true?

Accepted Answer

A)  Two F1F1F1S1F1F1F10 bonds are formed. 
B)  Two F1F1F1S1F1F1F10 bonds are broken. 
C)  Two F1F1F1S1F1F1F10 bonds are formed. 
D)  One F1F1F1S1F1F1F10 bond is formed. 
A)  Two F1F1F1S1F1F1F10 bonds are formed. 
B)  Two F1F1F1S1F1F1F10 bonds are broken. 
C)  Two F1F1F1S1F1F1F10 bonds are formed. 
D)  One F1F1F1S1F1F1F10 bond is formed.

Question 18

Which of the Keq corresponds to the most negative value of F1F1F1S1F1F1F10G°?

Accepted Answer

A)  Keq = 1 
B)  Keq = 101 
C)  Keq = 102 
D)  Keq = 103 
A)  Keq = 1 
B)  Keq = 101 
C)  Keq = 102 
D)  Keq = 103

Question 19

Which of the following statements is true?

Accepted Answer

A)  The product is favored in reaction in which F1F1F1S1F1F1F10H° 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 F1F1F1S1F1F1F10H° is a negative value. 
A)  The product is favored in reaction in which F1F1F1S1F1F1F10H° 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 F1F1F1S1F1F1F10H° is a negative value.

Question 20

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 provided 
A)  Step one 
B)  Step two 
C)  Step three 
D)  It cannot be determined from the information provided

Exam 6: Understanding Organic Reactions

In which reaction is Keq > 1?

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

Which of the following statements about enzymes is true?

Which of the following statements is true?

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

Which of the following statements is not true?

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

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

Which reaction is slowest?

Which of the following statements is true?

Which of the following statements about a catalyst is true?

Which compound would you predict to be highest in energy?

Which of the following statements about substitution reactions is true?

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

Which of the following statements about equilibrium is true?

Which of the following statements about addition reactions is true?

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

Which of the following statements is true?

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

Structure and Bonding

Acids and Bases

Introduction to Organic Molecules and Functional Groups

Alkanes

Stereochemistry

Alkyl Halides and Nucleophilic Substitution

Alkyl Halides and Elimination Reactions

Alcohols, Ethers and Epoxides

Alkenes

Alkynes

Oxidation and Reduction

Mass Spectrometry and Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Radical Reactions

Conjugation, Resonance, and Dienes

Benzene and Aromatic Compounds

Electrophilic Aromatic Substitution

Carboxylic Acids and the Acidity of the O-H Bond

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones Nucleophilic Addition

Carboxylic Acids and Derivatives

Substitution Reactions of Carbonyl Compounds at the Alpha-Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Lipids

Synthetic Polymers

Filters

In which reaction is K_eq > 1?

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

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