Question 1

What type of reaction does the following conversion represent?

Accepted Answer

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

Question 2

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. D

Question 3

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

Accepted Answer

A) DG° 
B) DH° 
C) Keq 
D) Ea 
A) DG° 
B) DH° 
C) Keq 
D) Ea D

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. 
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.

Question 5

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

Accepted Answer

A) Keq = 10-3 
B) Keq = 10-2 
C) Keq = 10-1 
D) DG° cannot be determined. 
A) Keq = 10-3 
B) Keq = 10-2 
C) Keq = 10-1 
D) DG° cannot be determined.

Question 6

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism:   If the concentration of -OCH3 were increased 5 times,what would happen to the rate of the reaction?

Accepted Answer

A) Rate would become one fifth 
B) Rate would increase 25 times 
C) Rate would increase 5 times 
D) Rate would remain unchanged 
A) Rate would become one fifth 
B) Rate would increase 25 times 
C) Rate would increase 5 times 
D) Rate would remain unchanged

Question 7

Which of the following statements is not true?

Accepted Answer

A) In polar reactions,a nucleophile reacts with an electrophile. 
B) Carbocations are electrophiles. 
C) Carbanions are nucleophiles. 
D) A half-headed curved arrow shows the movement of an electron pair. 
A) In polar reactions,a nucleophile reacts with an electrophile. 
B) Carbocations are electrophiles. 
C) Carbanions are nucleophiles. 
D) A half-headed curved arrow shows the movement of an electron pair.

Question 8

How many transition states are present in the reaction in the energy diagram?

Accepted Answer

A) 0 
B) 1 
C) 2 
D) 3 
A) 0 
B) 1 
C) 2 
D) 3

Question 9

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

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 10

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/Carbanion 
A) Homolysis/Radical 
B) Homolysis/Carbocation 
C) Heterolysis/Carbocation 
D) Heterolysis/Carbanion

Question 11

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. 
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 12

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. 
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 13

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

Accepted Answer

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

Question 14

Which of the following statements about elimination reactions is true?

Accepted Answer

A) Two σ bonds are broken. 
B) Two σ bonds are formed. 
C) Two π bonds are broken. 
D) Two π bonds are formed. 
A) Two σ bonds are broken. 
B) Two σ bonds are formed. 
C) Two π bonds are broken. 
D) Two π bonds are formed.

Question 15

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 16

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 
A) Energy of activation 
B) Concentration 
C) Temperature 
D) Kinetic energy

Question 17

The symbol hν stands for ________ in a chemical reaction.

Accepted Answer

A) light 
B) heat 
C) reactant 
D) product 
A) light 
B) heat 
C) reactant 
D) product

Question 18

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 19

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. 
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 20

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

Accepted Answer

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

Exam 6: Understanding Organic Reactions

What type of reaction does the following conversion represent?

Which of the following statements about equilibrium is true?

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

Which of the following statements is true?

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

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: If the concentration of -OCH3 were increased 5 times,what would happen to the rate of the reaction?

Which of the following statements is not true?

How many transition states are present in the reaction in the energy diagram?

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

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

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

Which of the following statements about substitution reactions is true?

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

Which of the following statements about elimination reactions is true?

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

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

The symbol hν stands for ________ in a chemical reaction.

Which compound would you predict to be highest in energy?

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

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

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 Related Compounds

Alkenes and Addition Reactions

Alkynes and Synthesis

Oxidation and Reduction

Radical Reactions

Conjugation, resonance, and Dienes

Benzene and Aromatic Compounds

Reactions of Aromatic Compounds

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

Aldehydes and Ketones - Nucleophilic Addition

Carboxylic Acids and the Acidity of the O-H Bond

Carboxylic Acids and Their Derivatives - Nucleophilic Acyl Substitution

Substitution Reactions of Carbonyl Compounds at the a Carbon

Carbonyl Condensation Reactions

Amines

Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

Pericyclic Reactions

Carbohydrates

Amino Acids and Proteins

Synthetic Polymers

Lipids

Molecular Ion Peaks and Fragmentation Patterns

Analyzing Molecular Motion and Infrared Spectroscopy

Organic Spectroscopy Concepts

Filters

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

The conversion of acetyl chloride to methyl acetate occurs via the following two-step mechanism: If the concentration of ^-OCH₃ were increased 5 times,what would happen to the rate of the reaction?