Question 1

Which of the following gas-phase reactions is a possible chain-terminating step in the light-initiated chlorination of methane?

Accepted Answer

A)  Cl-Cl $\rightarrow$ 2Cl· 
B)  Cl· + CH4 $\rightarrow$CH3· + H-Cl 
C)  CH3· + CH3· $\rightarrow$ CH3-CH3 
D)  CH3· + Cl-Cl $\rightarrow$CH3Cl + Cl· 
E)  More than one of the above 
A)  Cl-Cl $\rightarrow$ 2Cl· 
B)  Cl· + CH4 $\rightarrow$CH3· + H-Cl 
C)  CH3· + CH3· $\rightarrow$ CH3-CH3 
D)  CH3· + Cl-Cl $\rightarrow$CH3Cl + Cl· 
E)  More than one of the above

Question 2

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 3

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 4

A chain reaction is one that:

Accepted Answer

A)  involves a series of steps. 
B)  involves two steps of equal activation energy. 
C)  is one that can be initiated by light. 
D)  involves a series of steps,each of which generates a reactive intermediate that brings about the next step. 
E)  involves free radicals that have an unusual stability and thereby cause a large quantum yield. 
A)  involves a series of steps. 
B)  involves two steps of equal activation energy. 
C)  is one that can be initiated by light. 
D)  involves a series of steps,each of which generates a reactive intermediate that brings about the next step. 
E)  involves free radicals that have an unusual stability and thereby cause a large quantum yield.

Question 5

While the electrophilic addition of HBr to an alkene is ionic and follows Markovnikov's rule,if the reaction is done in the presence of peroxides it becomes a ___________ reaction and is ____________________ in regiochemistry.

Accepted Answer

radical or

Question 6

Which reaction would you expect to have the largest energy of activation? $\Delta$H° (kJ mol-1)

Accepted Answer

A)  CH3· + CH3· $\rightarrow$CH3CH3 -378 
B)  CH3· + Br· $\rightarrow$CH3Br -130 
C)  CH4 + I· $\rightarrow$CH3· + HI +142 
D)  CH4 + Br· $\rightarrow$CH3· + HBr +104 
E)  CH4 + Cl· $\rightarrow$CH3· + HCl +8 
A)  CH3· + CH3· $\rightarrow$CH3CH3 -378 
B)  CH3· + Br· $\rightarrow$CH3Br -130 
C)  CH4 + I· $\rightarrow$CH3· + HI +142 
D)  CH4 + Br· $\rightarrow$CH3· + HBr +104 
E)  CH4 + Cl· $\rightarrow$CH3· + HCl +8

Question 7

Provide a reasonable mechanistic explanation for the formation of small amounts of 3,3,4,4-teramethylhexane during the free-radical bromination of 2-methylbutane.

Accepted Answer

During the free radical bromination of 2

Question 8

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 9

The $\Delta$H° value is expected to be least for which indicated C-H bond of isopentane?

Accepted Answer

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

Question 10

When an alkane in which all hydrogen atoms are not equivalent is monosubstituted,use of this halogen produces a ratio of isomers which is essentially statistical,i.e. ,dependent only on the number of each type of hydrogen.

Accepted Answer

A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  All of the above 
A)  F2 
B)  Cl2 
C)  Br2 
D)  I2 
E)  All of the above

Question 11

A covalent bond breaking so that each of the resulting intermediates bears a single unpaired electron is an example of __________________ bond cleavage.

Accepted Answer

The answer of A covalent bond breaking so that each...

Question 12

What is the final product,C,obtained via the following 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 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 14

For which reaction would the transition state be most product-like?

Accepted Answer

A)  CH4 + Br· $\rightarrow$CH3· + HBr 
B)  CH3CH3 + Br· $\rightarrow$ CH3CH2· + HBr 
C) 
  
D) 
  
E) 
  
A)  CH4 + Br· $\rightarrow$CH3· + HBr 
B)  CH3CH3 + Br· $\rightarrow$ CH3CH2· + HBr 
C) 
  
D) 
  
E)

Which of the following gas-phase reactions is a possible chain-terminating step in the light-initiated chlorination of methane?

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

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

A chain reaction is one that:

While the electrophilic addition of HBr to an alkene is ionic and follows Markovnikov's rule,if the reaction is done in the presence of peroxides it becomes a _ reaction and is __________ in regiochemistry.

Which reaction would you expect to have the largest energy of activation? $\Delta$ H° (kJ mol^-1)

Provide a reasonable mechanistic explanation for the formation of small amounts of 3,3,4,4-teramethylhexane during the free-radical bromination of 2-methylbutane.

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

The $\Delta$ H° value is expected to be least for which indicated C-H bond of isopentane?

When an alkane in which all hydrogen atoms are not equivalent is monosubstituted,use of this halogen produces a ratio of isomers which is essentially statistical,i.e. ,dependent only on the number of each type of hydrogen.

A covalent bond breaking so that each of the resulting intermediates bears a single unpaired electron is an example of __________________ bond cleavage.

What is the final product,C,obtained via the following reaction sequence?

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

For which reaction would the transition state be most product-like?

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

Exam 10: Radical Reactions

Which of the following gas-phase reactions is a possible chain-terminating step in the light-initiated chlorination of methane?

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

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

A chain reaction is one that:

While the electrophilic addition of HBr to an alkene is ionic and follows Markovnikov's rule,if the reaction is done in the presence of peroxides it becomes a ___________ reaction and is ____________________ in regiochemistry.

Which reaction would you expect to have the largest energy of activation? Δ\DeltaΔ H° (kJ mol-1)

Provide a reasonable mechanistic explanation for the formation of small amounts of 3,3,4,4-teramethylhexane during the free-radical bromination of 2-methylbutane.

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

The Δ\DeltaΔ H° value is expected to be least for which indicated C-H bond of isopentane?

When an alkane in which all hydrogen atoms are not equivalent is monosubstituted,use of this halogen produces a ratio of isomers which is essentially statistical,i.e. ,dependent only on the number of each type of hydrogen.

A covalent bond breaking so that each of the resulting intermediates bears a single unpaired electron is an example of __________________ bond cleavage.

What is the final product,C,obtained via the following reaction sequence?

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

For which reaction would the transition state be most product-like?

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

While the electrophilic addition of HBr to an alkene is ionic and follows Markovnikov's rule,if the reaction is done in the presence of peroxides it becomes a _ reaction and is __________ in regiochemistry.

Which reaction would you expect to have the largest energy of activation? $\Delta$ H° (kJ mol^-1)

The $\Delta$ H° value is expected to be least for which indicated C-H bond of isopentane?

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