Question 1

Give the best product for the following reaction.

Accepted Answer

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

Question 2

Consider the reaction: CH3CH2 ∙ + Br2 → CH3CH2Br + Br ∙.Given that this reaction has an activation energy of +6 kcal/mol and a ΔH° of -22 kcal/mol,sketch a reaction-energy profile for this reaction.Label the axes and show Ea and ΔH° on your drawing.

Accepted Answer

Question 3

Give the best product for the reaction.

Accepted Answer

The answer of Give the best product for the reaction....

Question 4

The reaction Br2 + CH3Br → CH2Br2 + HBr was carried out.Which of the following mechanism steps is productive,but relatively unlikely to occur?

Accepted Answer

A) Br ∙ + CH3Br → HBr + ∙ CH2Br 
B) Br ∙ + ∙ CH2Br → CH2Br2 
C) Br ∙ + Br2 → Br2 + Br ∙ 
D) Br ∙ + ∙ CH3 → CH3Br 
A) Br ∙ + CH3Br → HBr + ∙ CH2Br 
B) Br ∙ + ∙ CH2Br → CH2Br2 
C) Br ∙ + Br2 → Br2 + Br ∙ 
D) Br ∙ + ∙ CH3 → CH3Br

Question 5

A sample of (R)-2-chlorobutane,   reacts with Br2 in the presence of light,and all the products having the formula C4H8BrCl were isolated.Two possible isomers are shown below:   Of these

Accepted Answer

A) only I was formed. 
B) both I and II were formed in equal amounts. 
C) both I and II were formed in unequal amounts. 
D) only II was formed. 
E) neither I nor II was formed. 
A) only I was formed. 
B) both I and II were formed in equal amounts. 
C) both I and II were formed in unequal amounts. 
D) only II was formed. 
E) neither I nor II was formed.

Question 6

Antioxidants

Accepted Answer

A) trap the damaging radicals in our cells. 
B) are called radical inhibitors. 
C) prevent oxidation reactions in our cells. 
D) prevent the aging process. 
E) all of the above. 
A) trap the damaging radicals in our cells. 
B) are called radical inhibitors. 
C) prevent oxidation reactions in our cells. 
D) prevent the aging process. 
E) all of the above.

Question 7

When butane undergoes free radical bromination,the product mixture contains 98% 2-bromobutane and 2% 1-bromobutane.How many times more susceptible to hydrogen atom abstraction is a secondary hydrogen in butane than is a primary hydrogen?

Accepted Answer

A) 100 
B) 73.5 
C) 50 
D) 8)7 
E) 1)5 
A) 100 
B) 73.5 
C) 50 
D) 8)7 
E) 1)5

Question 8

Which of the following does not occur in a propagation step in the free radical bromination of ethane to form bromoethane?

Accepted Answer

A) a C-H bond breaks 
B) a Br-H bond forms 
C) a C-Br bond forms 
D) a Br-Br bond breaks 
E) a C-C bond breaks 
A) a C-H bond breaks 
B) a Br-H bond forms 
C) a C-Br bond forms 
D) a Br-Br bond breaks 
E) a C-C bond breaks

Question 9

Which of the following reactions is a termination step in the free radical chlorination of methane?

Accepted Answer

A) Cl2 + Cl ∙ → Cl ∙ + Cl2 
B) Cl2 → 2 Cl ∙ 
C) ∙ CH3 + Cl ∙ → CH3Cl 
D) CH4 + Cl ∙ → HCl + ∙ CH3 
A) Cl2 + Cl ∙ → Cl ∙ + Cl2 
B) Cl2 → 2 Cl ∙ 
C) ∙ CH3 + Cl ∙ → CH3Cl 
D) CH4 + Cl ∙ → HCl + ∙ CH3

Question 10

What C5H12 isomer will give only a single monochlorination product?

Accepted Answer

(CH₃)₄C or n

Question 11

Which of the following products result from the disproportionation reaction between two propyl radicals?

Accepted Answer

A)    
B) CH3CH2CH3 + CH3CHCH3 
C) CH3CH2CH2CH2CH2CH3 
D) CH3CH2CH3 + CH2     CHCH3 
E) CH2     C   CH2 + CH3CH2CH3 
A)    
B) CH3CH2CH3 + CH3CHCH3 
C) CH3CH2CH2CH2CH2CH3 
D) CH3CH2CH3 + CH2     CHCH3 
E) CH2     C   CH2 + CH3CH2CH3

Question 12

Which of the following represents the best preparation of 2-cyclopentenol from cyclopentane?

Accepted Answer

A) 1)Br2,hυ 2.NaOCH3 3.NBS,CCl4 4.H2O 
B) 1)NBS,CCl4 2.Br2,CCl4 3.NaOH 
C) 1)Br2,hυ 2.H2O2 
D) 1)NBS,CCl4 2.NaOCH3 3.H2O2 
E) 1)NBS,CCl4 2.H2O2 3.Br2,CCl4 4.NaOCH3 
A) 1)Br2,hυ 2.NaOCH3 3.NBS,CCl4 4.H2O 
B) 1)NBS,CCl4 2.Br2,CCl4 3.NaOH 
C) 1)Br2,hυ 2.H2O2 
D) 1)NBS,CCl4 2.NaOCH3 3.H2O2 
E) 1)NBS,CCl4 2.H2O2 3.Br2,CCl4 4.NaOCH3

Question 13

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

Question 14

Consider the following monobromination reaction,then answer the following questions.   a)Give the structures and the IUPAC names for the products.
b)Give the common names for the products.
c)Calculate ΔH° for the overall reaction using the following data for the indicated bond dissociation energies:   d)Calculate the percent yield for each product.(relative rate of abstraction of 3° hydrogen is 1600; 2° is 82; and 1° is 1.)
e)Propose a step-by-step mechanism for the major product only.
f)Draw a schematic potential energy diagram for the rate-determining step (RDS)only.
g)Does the transition state of the RDS resemble more closely the reactants or the products?
h)Would the value of the activation energy be different for different alkanes? Explain.
i)Would the reaction slow down or speed up if I2 is used instead of Br2? Explain.

Accepted Answer

a) @#IMG-DLM& b) @#IMG-DLM& c)ΔH° for 2-bromobutane formatio

Question 15

Provide the major organic product of the reaction below.

Accepted Answer

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

Question 16

What sequence of reagents can be used to convert 3,3-dimethylpentane into 3,3-dimethyl-2-pentanone?

Accepted Answer

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

Question 17

An unknown sample is suspected of being either ethane or isobutane.How would you distinguish between the two alkanes?

Accepted Answer

A kinetic study of the rate of

Question 18

Give the best product for the following reaction.

Accepted Answer

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

Question 19

Predict the major monobromination product in the following reaction.

Accepted Answer

The answer of Predict the major monobromination product in the...

Question 20

Provide the structure of the major organic product of the following reaction.

Accepted Answer

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

Exam 12: Radicals

Give the best product for the following reaction.

Consider the reaction: CH3CH2 ∙ + Br2 → CH3CH2Br + Br ∙.Given that this reaction has an activation energy of +6 kcal/mol and a ΔH° of -22 kcal/mol,sketch a reaction-energy profile for this reaction.Label the axes and show Ea and ΔH° on your drawing.

Give the best product for the reaction.

The reaction Br2 + CH3Br → CH2Br2 + HBr was carried out.Which of the following mechanism steps is productive,but relatively unlikely to occur?

A sample of (R)-2-chlorobutane, reacts with Br2 in the presence of light,and all the products having the formula C4H8BrCl were isolated.Two possible isomers are shown below: Of these

Antioxidants

When butane undergoes free radical bromination,the product mixture contains 98% 2-bromobutane and 2% 1-bromobutane.How many times more susceptible to hydrogen atom abstraction is a secondary hydrogen in butane than is a primary hydrogen?

Which of the following does not occur in a propagation step in the free radical bromination of ethane to form bromoethane?

Which of the following reactions is a termination step in the free radical chlorination of methane?

What C5H12 isomer will give only a single monochlorination product?

Which of the following products result from the disproportionation reaction between two propyl radicals?

Which of the following represents the best preparation of 2-cyclopentenol from cyclopentane?

The major type of reactions that alkanes undergo is

Provide the major organic product of the reaction below.

What sequence of reagents can be used to convert 3,3-dimethylpentane into 3,3-dimethyl-2-pentanone?

An unknown sample is suspected of being either ethane or isobutane.How would you distinguish between the two alkanes?

Give the best product for the following reaction.

Predict the major monobromination product in the following reaction.

Provide the structure of the major organic product of the following reaction.

Remembering General Chemistry: Electronic Structure and Bonding

Acids and Bases: Central to Understanding Organic Chemistry

An Introduction to Organic Compounds: Nomenclature, physical Properties, and Structure

Isomers: the Arrangement of Atoms in Space

Alkenes: Structure,nomenclature,and an Introduction to Reactivity - Thermodynamics and Kinetics

The Reactions of Alkenes - the Stereochemistry of Addition Reactions

The Reactions of Alkynes - Introduction to Multistep Synthesis

Delocalized Electrons: Their Effect on Stability, pka, and the Products of a Reaction - Aromaticity and Electronic Effects: an Introduction to the Reactions of Benzene

Substitution and Elimination Reactions of Alkyl Halides

Reactions of Alcohols, ethers, epoxides, amines and Sulfur-Containing Compounds

Organometallic Compounds

Mass Spectrometry,infrared Spectroscopy,and Uvvis Spectroscopy

Nmr Spectroscopy

Reactions of Carboxylic Acids and Carboxylic Acid Derivatives

Reactions of Aldehydes and Ketones

Reactions at the Α-Carbon

Reactions of Benzene and Substituted Benzenes

More About Amines - Reactions of Heterocylic Compounds

The Organic Chemistry of Carbohydrates

Amino Acids,peptides,and Proteins

Catalysis in Organic Reactions and in Enzymatic Reactions

The Organic Chemistry of the Coenzymes, compounds Derived From Vitamins

The Organic Chemistry of the Metabolic Pathways

The Organic Chemistry of Lipids

The Chemistry of the Nucleic Acids

Synthetic Polymers

Pericyclic Reactions

Filters

Consider the reaction: CH₃CH₂∙ + Br₂ → CH₃CH₂Br + Br ∙.Given that this reaction has an activation energy of +6 kcal/mol and a ΔH° of -22 kcal/mol,sketch a reaction-energy profile for this reaction.Label the axes and show E_a and ΔH° on your drawing.

The reaction Br₂ + CH₃Br → CH₂Br₂ + HBr was carried out.Which of the following mechanism steps is productive,but relatively unlikely to occur?

A sample of (R)-2-chlorobutane, reacts with Br₂ in the presence of light,and all the products having the formula C₄H₈BrCl were isolated.Two possible isomers are shown below: Of these

What C₅H₁₂ isomer will give only a single monochlorination product?