Question 1

Which of the following reactions of alkenes is not stereospecific?

Accepted Answer

A)  bromination (treatment with Br2 in CHCl3) 
B)  hydrogenation (treatment with H2/Pt) 
C)  acid-catalyzed hydration (treatment with aqueous H2SO4) 
D)  bromohydrin formation (treatment with Br2/H2O) 
A)  bromination (treatment with Br2 in CHCl3) 
B)  hydrogenation (treatment with H2/Pt) 
C)  acid-catalyzed hydration (treatment with aqueous H2SO4) 
D)  bromohydrin formation (treatment with Br2/H2O)

Question 2

What is the best choice of reagent(s) to perform the following transformation?

Accepted Answer

(i) OsO₄; (

Question 3

What is the major organic product obtained from the following reaction?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 4

What type of reaction mechanism accounts for the reaction of an alkene with HBr to give an alkyl bromide?

Accepted Answer

A)  nucleophilic addition 
B)  electrophilic addition 
C)  radical addition 
D)  elimination 
A)  nucleophilic addition 
B)  electrophilic addition 
C)  radical addition 
D)  elimination

Question 5

What is the best choice of reagent(s) to perform the following transformation?

Accepted Answer

A)  H2O, H2SO4 
B)  HgSO4; followed by NaBH4 
C)  BH3; followed by H2O2 
D)  OsO4; followed by NaHSO3 
A)  H2O, H2SO4 
B)  HgSO4; followed by NaBH4 
C)  BH3; followed by H2O2 
D)  OsO4; followed by NaHSO3

Question 6

Provide the structure of the key intermediate in the following reaction?

Accepted Answer

The answer of Provide the structure of the key intermediate...

Question 7

What is the correct order of stability of the following carbocations (more stable > less stable)?

Accepted Answer

A)  1 > 2 > 3 
B)  2 > 1 > 3 
C)  2 > 3 > 1 
D)  3 > 2 > 1 
A)  1 > 2 > 3 
B)  2 > 1 > 3 
C)  2 > 3 > 1 
D)  3 > 2 > 1

Question 8

What is the major organic product obtained from the following reaction?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 9

Provide a neatly drawn mechanism for the following reaction, including curved arrows to show the movement of paris of electrons and the structure of reactive intermediates.

Accepted Answer

@#IMG-DLM& The reaction proceeds in thre

Question 10

What is (are) the major organic product(s) obtained from the following reaction?

Accepted Answer

A)  only 1 
B)  only 2 
C)  only 3 
D)  only 1 and 2 
A)  only 1 
B)  only 2 
C)  only 3 
D)  only 1 and 2

Question 11

What type of carbocation is shown?

Accepted Answer

A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary 
A)  primary 
B)  secondary 
C)  tertiary 
D)  quaternary

Question 12

Which of the following reactions of alkenes takes place with anti stereospecificity?

Accepted Answer

A)  bishydroxylation (treatment with OsO4 followed by NaHSO3) 
B)  hydrogenation (treatment with H2/Pt) 
C)  addition of HBr (treatment with HBr) 
D)  bromohydrin formation (treatment with Br2, H2O) 
A)  bishydroxylation (treatment with OsO4 followed by NaHSO3) 
B)  hydrogenation (treatment with H2/Pt) 
C)  addition of HBr (treatment with HBr) 
D)  bromohydrin formation (treatment with Br2, H2O)

Question 13

What is the best choice of reagent to perform the following transformation?

Accepted Answer

A)  Br2 
B)  HBr 
C)  Br2, H2O 
D)  N-bromosuccinimide 
A)  Br2 
B)  HBr 
C)  Br2, H2O 
D)  N-bromosuccinimide

Question 14

What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give an alcohol?

Accepted Answer

A)  carbocation 
B)  carbanion 
C)  radical 
D)  carbene 
A)  carbocation 
B)  carbanion 
C)  radical 
D)  carbene

Question 15

What type of reactive intermediate is formed in the reaction of an alkene with Br2 and water to give a bromohydrin?

Accepted Answer

A)  carbocation 
B)  carbanion 
C)  radical 
D)  cyclic bromonium ion 
A)  carbocation 
B)  carbanion 
C)  radical 
D)  cyclic bromonium ion

Question 16

What is the major organic product obtained from the following reaction?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 17

What is (are) the major organic product(s) obtained from the following reaction?

Accepted Answer

A)  only 1 
B)  only 2 
C)  only 3 
D)  only 1 and 2 
A)  only 1 
B)  only 2 
C)  only 3 
D)  only 1 and 2

Question 18

What is the major organic product obtained from the following reaction?

Accepted Answer

The answer of What is the major organic product obtained...

Question 19

What is the major organic product obtained from the following reaction?

Accepted Answer

The answer of What is the major organic product obtained...

Exam 6: Reactions of Alkenes

Which of the following reactions of alkenes is not stereospecific?

What is the best choice of reagent(s) to perform the following transformation?

What is the major organic product obtained from the following reaction?

What type of reaction mechanism accounts for the reaction of an alkene with HBr to give an alkyl bromide?

What is the best choice of reagent(s) to perform the following transformation?

Provide the structure of the key intermediate in the following reaction?

What is the correct order of stability of the following carbocations (more stable > less stable)?

What is the major organic product obtained from the following reaction?

Provide a neatly drawn mechanism for the following reaction, including curved arrows to show the movement of paris of electrons and the structure of reactive intermediates.

What is (are) the major organic product(s) obtained from the following reaction?

What type of carbocation is shown?

Which of the following reactions of alkenes takes place with anti stereospecificity?

What is the best choice of reagent to perform the following transformation?

What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give an alcohol?

What type of reactive intermediate is formed in the reaction of an alkene with Br2 and water to give a bromohydrin?

What is the major organic product obtained from the following reaction?

What is (are) the major organic product(s) obtained from the following reaction?

What is the major organic product obtained from the following reaction?

What is the major organic product obtained from the following reaction?

Covalent Bonding and Shapes of Molecules

Alkanes and Cycloalkanes

Stereoisomerism and Chirality

Acids and Bases

Alkenes: Bonding, Nomenclature, and Properties

Alkynes

Haloalkanes, Halogenation, and Radical Reactions

Nucleophilic Substitution and Beta-Elimination

Alcohols

Ethers, Epoxides, and Sulfides

Infrared Spectroscopy

Nuclear Magnetic Resonance Spectroscopy

Mass Spectrometry

An Introduction to Organometallic Compounds

Aldehydes and Ketones

Carboxylic Acids

Functional Derivatives of Carboxylic Acids

Enolate Anions and Enamines

Dienes, Conjugated Systems, and Pericyclic Reactions

Benzene and the Concept of Aromaticity

Reactions of Benzene and Its Derivatives

Filters

What type of reactive intermediate is formed in the reaction of an alkene with Br₂ and water to give a bromohydrin?