Consider the bond dissociation energies listed below in kcal/mol. CH3-Br 70 CH3CH2-Br 68 (CH3)2CH-Br 68 (CH3)3C-Br 65 These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.

A) methyl carbon B) primary carbon C) secondary carbon D) tertiary carbon E) quaternary carbon A) methyl carbon B) primary carbon C) secondary carbon D) tertiary carbon E) quaternary carbon

Consider the following substitution reaction with a ΔG° value of -91.1 kJ/mole. HO- + CH3Cl ↔ CH3OH + Cl- Given this information which of the following statements must be true? (R = 8.315 J/mole K)

A) The Keq at 25°C for this reaction is very large, in other words this reaction proceeds to near completion as written, left to right under standard conditions. B) The Keq at 25°C for this reaction is very small (3OH and Cl-). In other words there is more product than at 25°C. D) At 250°C the equilibrium concentration of products and reactants is nearly the same. E) Both A and C are correct. A) The Keq at 25°C for this reaction is very large, in other words this reaction proceeds to near completion as written, left to right under standard conditions. B) The Keq at 25°C for this reaction is very small (3OH and Cl-). In other words there is more product than at 25°C. D) At 250°C the equilibrium concentration of products and reactants is nearly the same. E) Both A and C are correct.

Given the bond dissociation energies below (in kcal/mol), estimate the ΔH° for the propagation step CH3CH2CH2-H 98 (CH3)2CH-H 95 Cl-Cl 58 H-Cl 103 CH3CH2CH2-Cl 81 (CH3)2CH-Cl 80

A) -22 kcal/mol B) +22 kcal/mol C) -40 kcal/mol D) +45 kcal/mol A) -22 kcal/mol B) +22 kcal/mol C) -40 kcal/mol D) +45 kcal/mol

Exam 4: The Study of Chemical Reactions

Consider the bond dissociation energies listed below in kcal/mol. CH₃-Br 70 CH₃CH₂-Br 68 (CH₃)₂CH-Br 68 (CH₃)₃C-Br 65 These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.

(Multiple Choice)

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Question 61

Consider the reaction of A being converted into B at 25°C. If the ΔG° of this reaction is the K_eq is and the % conversion is .

(Multiple Choice)

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Question 62

Which of the halogens below undergoes free radical halogenation with ethane most rapidly?

(Multiple Choice)

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Question 63

How many secondary hydrogens are present in the hydrocarbon below?

(Multiple Choice)

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Question 64

Assume the reaction A + B → C + D proceeds to equilibrium. Calculate the equilibrium concentration of D at given that the starting concentrations of A and B are 2M and that △G° for the reaction is

(Multiple Choice)

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Question 65

In the hydrocarbon shown below, how many tertiary hydrogens are present?

(Multiple Choice)

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Question 66

The following reaction occurs readily: Experimentally one finds that if the concentration of I^- is doubled, the rate doubles. Also if the concentration of CH₃Br is halved, the rate is halved. What is the rate equation for this reaction?

(Short Answer)

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Question 67

Draw an energy diagram for a two step reaction where the structure of the transition state of the rate determining step most closely resembles the starting material and the overall reaction is exothermic.

(Essay)

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Question 68

Consider the following substitution reaction with a ΔG° value of -91.1 kJ/mole. HO- + CH₃Cl ↔ CH₃OH + Cl- Given this information which of the following statements must be true? (R = 8.315 J/mole K)

(Multiple Choice)

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Question 69

Which of the following correctly expresses the standard Gibbs free energy change of a reaction in terms of the changes in enthalpy and entropy?

(Multiple Choice)

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Question 70

When 1,1,3,3-tetramethylcyclobutane is brominated at 125°C, the relative reactivity of the 1°: 2°: 3° hydrogens is approximately 1:82:1600. Estimate the amount of each monobromination product.

(Essay)

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Question 71

What C₅H₁₂ isomer will give only a single monochlorination product?

(Essay)

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Question 72

Species with unpaired electrons are called ________.

(Short Answer)

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Question 73

Given the bond dissociation energies below (in kcal/mol), estimate the ΔH° for the propagation step CH₃CH₂CH₂-H 98 (CH₃)₂CH-H 95 Cl-Cl 58 H-Cl 103 CH₃CH₂CH₂-Cl 81 (CH₃)₂CH-Cl 80

(Multiple Choice)

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Question 74

Which of the following statements correctly describes the contribution of to

(Multiple Choice)

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Question 75

In the presence of a small amount of bromine, the following light-promoted reaction has been observed. Write a mechanism for this reaction, making sure to explain how both products are formed.

(Essay)

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Question 76

Which compound has the smaller bond dissociation energy for its carbon-chlorine bond, CH₃Cl or (CH₃)₃CCl? Explain your reasoning.

(Essay)

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Question 77

Consider the reaction: CH₃CH₂∙ + Br₂ → CH₃CH₂Br + Br∙ . Given that this reaction has an activation energy of +6 kcal/mol and a of sketch a reaction-energy diagram for this reaction. Label the axes and show E_a and on your drawing.

(Essay)

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Question 78

The major monobrominated product which results when ethylcyclohexane is subjected to free radical bromination is ________.

(Multiple Choice)

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Question 79

Which of the following is true for the termination step of a free radical chlorination reaction?

(Multiple Choice)

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Question 80

Showing 61 - 80 of 128

Exam 4: The Study of Chemical Reactions

Consider the bond dissociation energies listed below in kcal/mol. CH3-Br 70 CH3CH2-Br 68 (CH3)2CH-Br 68 (CH3)3C-Br 65 These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.

Consider the reaction of A being converted into B at 25°C. If the ΔG° of this reaction is the Keq is ________ and the % conversion is ________.

Which of the halogens below undergoes free radical halogenation with ethane most rapidly?

How many secondary hydrogens are present in the hydrocarbon below?

Assume the reaction A + B → C + D proceeds to equilibrium. Calculate the equilibrium concentration of D at given that the starting concentrations of A and B are 2M and that △G° for the reaction is

In the hydrocarbon shown below, how many tertiary hydrogens are present?

The following reaction occurs readily: Experimentally one finds that if the concentration of I- is doubled, the rate doubles. Also if the concentration of CH3Br is halved, the rate is halved. What is the rate equation for this reaction?

Draw an energy diagram for a two step reaction where the structure of the transition state of the rate determining step most closely resembles the starting material and the overall reaction is exothermic.

Consider the following substitution reaction with a ΔG° value of -91.1 kJ/mole. HO- + CH3Cl ↔ CH3OH + Cl- Given this information which of the following statements must be true? (R = 8.315 J/mole K)

Which of the following correctly expresses the standard Gibbs free energy change of a reaction in terms of the changes in enthalpy and entropy?

When 1,1,3,3-tetramethylcyclobutane is brominated at 125°C, the relative reactivity of the 1°: 2°: 3° hydrogens is approximately 1:82:1600. Estimate the amount of each monobromination product.

What C5H12 isomer will give only a single monochlorination product?

Species with unpaired electrons are called ________.

Given the bond dissociation energies below (in kcal/mol), estimate the ΔH° for the propagation step CH3CH2CH2-H 98 (CH3)2CH-H 95 Cl-Cl 58 H-Cl 103 CH3CH2CH2-Cl 81 (CH3)2CH-Cl 80

Which of the following statements correctly describes the contribution of to

In the presence of a small amount of bromine, the following light-promoted reaction has been observed. Write a mechanism for this reaction, making sure to explain how both products are formed.

Which compound has the smaller bond dissociation energy for its carbon-chlorine bond, CH3Cl or (CH3)3CCl? Explain your reasoning.

Consider the reaction: CH3CH2∙ + Br2 → CH3CH2Br + Br∙ . Given that this reaction has an activation energy of +6 kcal/mol and a of sketch a reaction-energy diagram for this reaction. Label the axes and show Ea and on your drawing.

The major monobrominated product which results when ethylcyclohexane is subjected to free radical bromination is ________.

Which of the following is true for the termination step of a free radical chlorination reaction?

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Stereochemistry

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Structure and Synthesis of Alkenes; Elimination

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Consider the bond dissociation energies listed below in kcal/mol. CH₃-Br 70 CH₃CH₂-Br 68 (CH₃)₂CH-Br 68 (CH₃)₃C-Br 65 These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.

Consider the reaction of A being converted into B at 25°C. If the ΔG° of this reaction is the K_eq is and the % conversion is .

The following reaction occurs readily: Experimentally one finds that if the concentration of I^- is doubled, the rate doubles. Also if the concentration of CH₃Br is halved, the rate is halved. What is the rate equation for this reaction?

Consider the following substitution reaction with a ΔG° value of -91.1 kJ/mole. HO- + CH₃Cl ↔ CH₃OH + Cl- Given this information which of the following statements must be true? (R = 8.315 J/mole K)

What C₅H₁₂ isomer will give only a single monochlorination product?

Given the bond dissociation energies below (in kcal/mol), estimate the ΔH° for the propagation step CH₃CH₂CH₂-H 98 (CH₃)₂CH-H 95 Cl-Cl 58 H-Cl 103 CH₃CH₂CH₂-Cl 81 (CH₃)₂CH-Cl 80

Which compound has the smaller bond dissociation energy for its carbon-chlorine bond, CH₃Cl or (CH₃)₃CCl? Explain your reasoning.

Consider the reaction: CH₃CH₂∙ + Br₂ → CH₃CH₂Br + Br∙ . Given that this reaction has an activation energy of +6 kcal/mol and a of sketch a reaction-energy diagram for this reaction. Label the axes and show E_a and on your drawing.