Question 1

Calculate the overall ΔH° for the reaction shown given the bond dissociation energies (in kcal/mol)below: (CH3)3C-H + Cl-Cl → (CH3)3C - Cl + H-Cl
91 58 78.5 103

Accepted Answer

A) +181.5 kcal/mole 
B) +58.0 kcal/mole 
C) +32.5 kcal/mole 
D) -32.5 kcal/mole 
E) -57.5 kcal/mole

Question 2

The major type of reactions that alkanes undergo is ________.

Accepted Answer

A) electrophilic substitution reactions 
B) electrophilic addition reactions 
C) free radical substitution reactions 
D) free radical addition reactions 
E) nucleophilic substitution reactions

Question 3

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.

Accepted Answer

The answer of When 1,1,3,3-tetramethylcyclobutane is brominated at 125°C, the...

Question 4

What sequence of reagents can be used to accomplish the conversion shown below?

Accepted Answer

The answer of What sequence of reagents can be used...

Question 5

Provide the major organic product of the following reactions.

Accepted Answer

The answer of Provide the major organic product of the...

Question 6

Give the best product for the following reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 7

Which of the following statements concerning the use of hydrocarbons as fuels is not correct?

Accepted Answer

A) The alkane n-octane has an octane number of 100 which indicates its high performance in automobile engines. 
B) Catalytic cracking converts straight-chain hydrocarbons that are poor fuels into branched-chain compounds. 
C) When poor fuels are used in an engine, combustion can occur before the spark plug fires which results in knocking. 
D) The quality of a fuel is indicated by its octane number, and a higher octane number typically results in less engine knocking. 
E) none of the above

Question 8

Rank the free radicals (I-III)shown below in order of decreasing stability (i.e., from most stable to least stable).

Accepted Answer

A) I > III > II 
B) II > III > I 
C) I > II > III 
D) II > I > III 
E) III > II > I

Question 9

Which of the following is the most stable radical?

Accepted Answer

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

Question 10

Which of the following is the initiation step for the monobromination of cyclohexane?

Accepted Answer

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

Exam 13: Reactions of Alkanes, Radicals

Calculate the overall ΔH° for the reaction shown given the bond dissociation energies (in kcal/mol) below: (CH₃) ₃C-H + Cl-Cl → (CH₃) ₃C- Cl + H-Cl 91 58 78.5 103

The major type of reactions that alkanes undergo is ________.

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 sequence of reagents can be used to accomplish the conversion shown below?

Provide the major organic product of the following reactions.

Give the best product for the following reaction.

Which of the following statements concerning the use of hydrocarbons as fuels is not correct?

Rank the free radicals (I-III) shown below in order of decreasing stability (i.e., from most stable to least stable) .

Which of the following is the most stable radical?

Which of the following is the initiation step for the monobromination of cyclohexane?

Exam 13: Reactions of Alkanes, Radicals

Calculate the overall ΔH° for the reaction shown given the bond dissociation energies (in kcal/mol) below: (CH3) 3C-H + Cl-Cl → (CH3) 3C - Cl + H-Cl 91 58 78.5 103

The major type of reactions that alkanes undergo is ________.

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 sequence of reagents can be used to accomplish the conversion shown below?

Provide the major organic product of the following reactions.

Give the best product for the following reaction.

Which of the following statements concerning the use of hydrocarbons as fuels is not correct?

Rank the free radicals (I-III) shown below in order of decreasing stability (i.e., from most stable to least stable) .

Which of the following is the most stable radical?

Which of the following is the initiation step for the monobromination of cyclohexane?

Calculate the overall ΔH° for the reaction shown given the bond dissociation energies (in kcal/mol) below: (CH₃) ₃C-H + Cl-Cl → (CH₃) ₃C- Cl + H-Cl 91 58 78.5 103