Question 1

Which of the following carbocations would NOT be likely to undergo rearrangement?

Accepted Answer

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

Question 2

The structure of the product,C,of the following sequence of reactions would be:

Accepted Answer

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

Question 3

Which alcohol would initially produce the most stable carbocation when treated with concentrated H2SO4?

Accepted Answer

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

Question 4

What is the major product for the following reaction?

Accepted Answer

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

Question 5

Propose a reasonable synthetic strategy for the synthesis of trans-6-methyl-3-heptene from 4-methyl-1-pentyne.

Accepted Answer

@#IMG-DLM& Step 1: Add NaNH₂/NH₃(l)to selectively de

Question 6

What is the major product of the reaction of the following reaction?

Accepted Answer

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

Question 7

What is the major product for the following reaction sequence?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E)  None of the above 
A) 
  
B) 
  
C) 
  
D) 
  
E)  None of the above

Question 8

Which statement(s)is/are true of acid-catalyzed alcohol dehydrations?

Accepted Answer

A)  Protonation of the alcohol is a fast step. 
B)  Formation of a carbocation from the protonated alcohol is a slow step. 
C)  Rearrangements of less stable carbocations to more stable carbocations are common. 
D)  Loss of a proton by the carbocation is a fast step. 
E)  All of the above 
A)  Protonation of the alcohol is a fast step. 
B)  Formation of a carbocation from the protonated alcohol is a slow step. 
C)  Rearrangements of less stable carbocations to more stable carbocations are common. 
D)  Loss of a proton by the carbocation is a fast step. 
E)  All of the above

Question 9

What is the major product for the following reaction?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E)  More than one of the above 
A) 
  
B) 
  
C) 
  
D) 
  
E)  More than one of the above

Question 10

What is the major product for the following reaction?

Accepted Answer

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

Question 11

Carbocations are frequent intermediates in acidic reactions of alkenes,alcohols,etc.What do carbocations usually do? They may:

Accepted Answer

A)  rearrange to a more stable carbocation. 
B)  lose a proton to form an alkene. 
C)  combine with a nucleophile. 
D)  react with an alkene to form a larger carbocation. 
E)  do all of the above. 
A)  rearrange to a more stable carbocation. 
B)  lose a proton to form an alkene. 
C)  combine with a nucleophile. 
D)  react with an alkene to form a larger carbocation. 
E)  do all of the above.

Question 12

Carbocations have three options available for further reaction.These options include reaction with a nucleophile,loss of a beta proton to give an alkene,and ________________.

Accepted Answer

The answer of Carbocations have three options available for further...

Question 13

A correct IUPAC name for the following compound is:

Accepted Answer

A)  3,3,5-trimethyl-2-hexene 
B)  3-isobutyl-3-isopropyl-2-propene 
C)  3-isobutyl-4-methyl-2-pentene 
D)  3-(1-methylethyl)-5-methyl-2-hexene 
E)  None of the above 
A)  3,3,5-trimethyl-2-hexene 
B)  3-isobutyl-3-isopropyl-2-propene 
C)  3-isobutyl-4-methyl-2-pentene 
D)  3-(1-methylethyl)-5-methyl-2-hexene 
E)  None of the above

Question 14

What is the major product for the following reaction?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
E)  More than one of the above 
A) 
  
B) 
  
C) 
  
D) 
  
E)  More than one of the above

Question 15

Which statement is/are true about acetylide anions?

Accepted Answer

A)  They do not alkylate with secondary alkyl halides. 
B)  Primary alkyl halides are best suited for alkylation. 
C)  In the presence of tertiary alkyl halides,the acetylide anion acts as base to give an elimination product. 
D)  Only two of the above are true. 
E)  All of the statements are true. 
A)  They do not alkylate with secondary alkyl halides. 
B)  Primary alkyl halides are best suited for alkylation. 
C)  In the presence of tertiary alkyl halides,the acetylide anion acts as base to give an elimination product. 
D)  Only two of the above are true. 
E)  All of the statements are true.

Question 16

Conversion of alkynes to E-alkenes (trans-alkenes)can be accomplished via a __________________ reaction.

Accepted Answer

dissolving

Question 17

Alkynes can be produced from either __________________ or _________________ dihalides.

Accepted Answer

The answer of Alkynes can be produced from either __________________...

Question 18

Concerning the relative stabilities of alkenes,which is a false statement?

Accepted Answer

A)  Unless hydrogenation of the alkenes gives the same alkane,heats of hydrogenation cannot be used to measure their relative stabilities. 
B)  In general,the greater the number of alkyl groups attached to the carbon atoms of the double bond,the greater the stability of the alkene. 
C)  The greater the quantity of heat liberated on combustion or hydrogenation of an alkene,the greater its energy content. 
D)  trans-Cycloalkenes are always more stable than the cis-isomers. 
E)  Heats of combustion can be used to measure the relative stabilities of isomeric alkenes,even though their hydrogenation products are not identical. 
A)  Unless hydrogenation of the alkenes gives the same alkane,heats of hydrogenation cannot be used to measure their relative stabilities. 
B)  In general,the greater the number of alkyl groups attached to the carbon atoms of the double bond,the greater the stability of the alkene. 
C)  The greater the quantity of heat liberated on combustion or hydrogenation of an alkene,the greater its energy content. 
D)  trans-Cycloalkenes are always more stable than the cis-isomers. 
E)  Heats of combustion can be used to measure the relative stabilities of isomeric alkenes,even though their hydrogenation products are not identical.

Question 19

Complete the following reaction,giving structural details of all intermediates as well as the final product.

Accepted Answer

The answer of Complete the following reaction,giving structural details of...

Question 20

The correct IUPAC name for the following compound is:

Accepted Answer

A)  (
E) -2-Bromo-3-chloro-5-methyl-2-hexene 
B)  (
E) -2-Bromo-3-chloro-5-methyl-3-hexene 
C)  (Z)-2-Bromo-3-chloro-5-methyl-3-hexene 
D)  (Z)-2-Bromo-3-chloro-5-methyl-2-hexene 
E)  (
E) -2-Methyl-5-bromo-4-chloro-4-hexene 
A)  (
E) -2-Bromo-3-chloro-5-methyl-2-hexene 
B)  (
E) -2-Bromo-3-chloro-5-methyl-3-hexene 
C)  (Z)-2-Bromo-3-chloro-5-methyl-3-hexene 
D)  (Z)-2-Bromo-3-chloro-5-methyl-2-hexene 
E)  (
E) -2-Methyl-5-bromo-4-chloro-4-hexene

Exam 7: Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

Which of the following carbocations would NOT be likely to undergo rearrangement?

The structure of the product,C,of the following sequence of reactions would be:

Which alcohol would initially produce the most stable carbocation when treated with concentrated H2SO4?

What is the major product for the following reaction?

Propose a reasonable synthetic strategy for the synthesis of trans-6-methyl-3-heptene from 4-methyl-1-pentyne.

What is the major product of the reaction of the following reaction?

What is the major product for the following reaction sequence?

Which statement(s)is/are true of acid-catalyzed alcohol dehydrations?

What is the major product for the following reaction?

What is the major product for the following reaction?

Carbocations are frequent intermediates in acidic reactions of alkenes,alcohols,etc.What do carbocations usually do? They may:

Carbocations have three options available for further reaction.These options include reaction with a nucleophile,loss of a beta proton to give an alkene,and ________________.

A correct IUPAC name for the following compound is:

What is the major product for the following reaction?

Which statement is/are true about acetylide anions?

Conversion of alkynes to E-alkenes (trans-alkenes)can be accomplished via a __________________ reaction.

Alkynes can be produced from either __________________ or _________________ dihalides.

Concerning the relative stabilities of alkenes,which is a false statement?

Complete the following reaction,giving structural details of all intermediates as well as the final product.

The correct IUPAC name for the following compound is:

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 Ii: Addition Reactions

Nuclear Magnetic Resonance and Mass Spectrometry: Tools for Structure Determination

Radical Reactions

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 alcohol would initially produce the most stable carbocation when treated with concentrated H₂SO₄?

Alkynes can be produced from either __ or _ dihalides.