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

Question 2

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

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV A

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. D

Question 4

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 5

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

Question 6

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

Question 7

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 8

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

Question 9

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

Question 11

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 12

If the conversion of A to B is slow and B to C is fast,what is the rate equation for this reaction?

Accepted Answer

A) Rate = k[(CH3)2CHCl][H2O] 
B) Rate = k[(CH3)2CHCl] 
C) Rate = k[(CH3)2CH]+[H2O] 
D) Rate = k[(CH3)2CH]+ 
A) Rate = k[(CH3)2CHCl][H2O] 
B) Rate = k[(CH3)2CHCl] 
C) Rate = k[(CH3)2CH]+[H2O] 
D) Rate = k[(CH3)2CH]+

Question 13

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 14

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

Question 15

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. 
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.

Question 16

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 17

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?

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 
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 18

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

Question 19

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 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 
A) +108 KJ/mol 
B) -130 KJ/mol 
C) -22 KJ/mol 
D) +22 KJ/mol

Exam 6: Understanding Organic Reactions

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

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

Which of the following statements about enzymes is true?

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

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

Which of the following letters represents DH° for the forward reaction in the following energy diagram?

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

What type of reaction does the following conversion represent?

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

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

Which of the following statements about a catalyst is true?

If the conversion of A to B is slow and B to C is fast,what is the rate equation for this reaction?

Which of the following statements is true?

Which of the following statements is true?

Which of the following statements about bond breaking is true?

Which of the following statements about substitution reactions is true?

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?

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

Which of the following statements about equilibrium is true?

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

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

Spectroscopy A: Mass Spectrometry

Spectroscopy B: Infrared Spectroscopy

Spectroscopy C: Nuclear Magnetic Resonance Spectroscopy

Filters

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

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?