Question 1

Which of the following reactions would have an activation energy equal to zero?

Accepted Answer

A)  CH3-CH3 --$\rightarrow$ 2CH3· 
B)  H· + CH3CH3 --$\rightarrow$ CH3CH3 + H· 
C)  2CH3CH2· --$\rightarrow$CH3CH2CH2CH3 
D)  CH3· + CH3CH3 --$\rightarrow$CH3CH3 + CH3· 
E)  None of the above 
A)  CH3-CH3 --$\rightarrow$ 2CH3· 
B)  H· + CH3CH3 --$\rightarrow$ CH3CH3 + H· 
C)  2CH3CH2· --$\rightarrow$CH3CH2CH2CH3 
D)  CH3· + CH3CH3 --$\rightarrow$CH3CH3 + CH3· 
E)  None of the above

Question 2

Complete the following reaction sequence: indicate regiochemical/stereochemical details as relevant.

Accepted Answer

The answer of Complete the following reaction sequence: indicate regiochemical/stereochemical...

Question 3

The bond dissociation energies for the relevant bonds are given below each of the species involved in the following reaction.Calculate the overall$\Delta$H° for the reaction.

Accepted Answer

A)  +437 kJ / mol 
B)  -437 kJ / mol 
C)  -411 kJ / mol 
D)  +26 kJ / mol 
E)  -1581 kJ / mol  
A)  +437 kJ / mol 
B)  -437 kJ / mol 
C)  -411 kJ / mol 
D)  +26 kJ / mol 
E)  -1581 kJ / mol

Question 4

In a chain-terminating step,radicals are ______________.

Accepted Answer

The answer of In a chain-terminating step,radicals are ______________....

Question 5

Complete the following reaction sequence: indicate regiochemical/stereochemical details as relevant.

Accepted Answer

The answer of Complete the following reaction sequence: indicate regiochemical/stereochemical...

Question 6

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

Accepted Answer

A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He 
A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He

Question 7

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

Accepted Answer

A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He 
A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He

Question 8

Briefly,but clearly,explain the following observation: While alkanes can be fluorinated,chlorinated and brominated easily,they do not easily undergo iodination.

Accepted Answer

The energy of activation for the first p

Question 9

In the presence of light at 25°C,isobutane (1 mol)and bromine (1 mol)yield which monobromo product(s)?

Accepted Answer

A)  2-Methyl-1-bromopropane (almost exclusively) 
B)  2-Methyl-2-bromopropane (almost exclusively) 
C)  A mixture of 50% (
A) and 50% (
B)  
D)  A mixture of 90% (
A) and 10% (
B)  
E)  Butyl bromide 
A)  2-Methyl-1-bromopropane (almost exclusively) 
B)  2-Methyl-2-bromopropane (almost exclusively) 
C)  A mixture of 50% (
A) and 50% (
B)  
D)  A mixture of 90% (
A) and 10% (
B)  
E)  Butyl bromide

Question 10

What product(s)might be obtained via chain-termination step(s)during the reaction of 2-methylpropene with HBr in presence of peroxides?

Accepted Answer

The addition of HBr to 2-methylpropene t

Question 11

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

Accepted Answer

A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He 
A)  Ha 
B)  Hb 
C)  Hc 
D)  Hd 
E)  He

Question 12

What is the product for the following three-step reaction sequence?

Accepted Answer

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

Question 13

Which of the reactions listed below would be exothermic?

Accepted Answer

A)  CH3-CH3 $\rightarrow$ 2CH3· 
B)  CH3· + CH4 $\rightarrow$CH4 + CH3· 
C)  2(CH3)2CH· $\rightarrow$(CH3)2CH-CH(CH3)2 
D)  H· + (CH3)3CH $\rightarrow$(CH3)3CH + H· 
E)  None of the above 
A)  CH3-CH3 $\rightarrow$ 2CH3· 
B)  CH3· + CH4 $\rightarrow$CH4 + CH3· 
C)  2(CH3)2CH· $\rightarrow$(CH3)2CH-CH(CH3)2 
D)  H· + (CH3)3CH $\rightarrow$(CH3)3CH + H· 
E)  None of the above

Question 14

Hydrogen atom abstraction from which position would yield the most stable free radical intermediate during the reaction of bromine with 2,2,3-trimethylpentane?

Accepted Answer

A)  C1 
B)  C2 
C)  C3 
D)  C4 
E)  C5 
A)  C1 
B)  C2 
C)  C3 
D)  C4 
E)  C5

Question 15

Free radical chlorination of hexane produces this number of monochloro derivatives (including stereoisomers):

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  7 
E)  8 
A)  3 
B)  4 
C)  5 
D)  7 
E)  8

Question 16

Mono-bromination of the following alkane,   , (using Br2 with light)would be?

Accepted Answer

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

Question 17

For which of the following gas-phase reactions would the Eact be equal to $\Delta$H°?

Accepted Answer

A)  Cl-Cl $\rightarrow$ 2Cl· 
B)  2 Cl· $\rightarrow$ Cl-Cl 
C)  Cl· + CH4 $\rightarrow$CH3· + H-Cl 
D)  CH3· + CH3· $\rightarrow$ CH3-CH3 
E)  CH3· + Cl-Cl$\rightarrow$CH3-Cl + Cl· 
A)  Cl-Cl $\rightarrow$ 2Cl· 
B)  2 Cl· $\rightarrow$ Cl-Cl 
C)  Cl· + CH4 $\rightarrow$CH3· + H-Cl 
D)  CH3· + CH3· $\rightarrow$ CH3-CH3 
E)  CH3· + Cl-Cl$\rightarrow$CH3-Cl + Cl·

Question 18

In a chain-initiating step,radicals are _____________.

Accepted Answer

The answer of In a chain-initiating step,radicals are _____________....

Question 19

The bond dissociation energies for the relevant bonds are given below each of the species involved in the following reaction.Calculate the overall $\Delta$H° for the reaction.

Accepted Answer

A)  +616 kJ / mol 
B)  -101 kJ / mol 
C)  -173 kJ / mol 
D)  +57 kJ kJ / mol 
E)  -44 kJ / mol 
A)  +616 kJ / mol 
B)  -101 kJ / mol 
C)  -173 kJ / mol 
D)  +57 kJ kJ / mol 
E)  -44 kJ / mol

Question 20

What is the product for the following three-step reaction sequence?

Accepted Answer

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

Exam 10: Radical Reactions

Which of the following reactions would have an activation energy equal to zero?

Complete the following reaction sequence: indicate regiochemical/stereochemical details as relevant.

The bond dissociation energies for the relevant bonds are given below each of the species involved in the following reaction.Calculate the overall Δ\DeltaΔ H° for the reaction.

In a chain-terminating step,radicals are ______________.

Complete the following reaction sequence: indicate regiochemical/stereochemical details as relevant.

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

Briefly,but clearly,explain the following observation: While alkanes can be fluorinated,chlorinated and brominated easily,they do not easily undergo iodination.

In the presence of light at 25°C,isobutane (1 mol)and bromine (1 mol)yield which monobromo product(s)?

What product(s)might be obtained via chain-termination step(s)during the reaction of 2-methylpropene with HBr in presence of peroxides?

Which hydrogen would be abstracted first when mono-brominating with Br2 and light?

What is the product for the following three-step reaction sequence?

Which of the reactions listed below would be exothermic?

Hydrogen atom abstraction from which position would yield the most stable free radical intermediate during the reaction of bromine with 2,2,3-trimethylpentane?

Free radical chlorination of hexane produces this number of monochloro derivatives (including stereoisomers):

Mono-bromination of the following alkane, , (using Br2 with light)would be?

For which of the following gas-phase reactions would the Eact be equal to Δ\DeltaΔ H°?

In a chain-initiating step,radicals are _____________.

The bond dissociation energies for the relevant bonds are given below each of the species involved in the following reaction.Calculate the overall Δ\DeltaΔ H° for the reaction.

What is the product for the following three-step reaction sequence?

Carbon Compounds and Chemical Bonds

Representative Carbon Compounds: Functional Groups, Intermolecular Forces, and Infrared Ir Spectroscopy

An Introduction to Organic Reactions: Acids and Bases

Alkanes: Nomenclature, Conformational Analysis, and an Introduction to Synthesis

Stereochemistry: Chiral Molecules

Ionic Reactions - Nucleophilic Substitution and Elimination Reactions of Alkyl Halides

Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Alkenes and Alkynes Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Alcohols and Ethers

Alcohols From Carbonyl Compounds Oxidation-Reduction and Organometallic Compounds

Conjugated Unsaturated Systems

Aromatic Compounds

Reactions of Aromatic Compounds

Aldehydes and Ketones I Nucleophilic Addition to the Carbonyl Group

Aldehydes and Ketones Ii Aldol Reactions

Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Synthesis and Reactions of Beta-Dicarbonyl Compounds: More Chemistry of Enolate Ions

Amines

Phenols and Aryl Halides: Nucleophilic Aromatic Substitution

Carbohydrates

Lipids

Amino Acids and Proteins

Nucleic Acids and Protein Synthesis

Filters

Which hydrogen would be abstracted first when mono-brominating with Br₂ and light?

Which hydrogen would be abstracted first when mono-brominating with Br₂ and light?

Which hydrogen would be abstracted first when mono-brominating with Br₂ and light?

Mono-bromination of the following alkane, , (using Br₂ with light)would be?

For which of the following gas-phase reactions would the E_act be equal to $\Delta$ H°?