Question 1

As shown below,when cis-2-butene reacts with dichlorocarbene,only the cis-1,1-dichloro-2,3-dimethylcyclopropane is formed.What can we conclude about the nature of the reaction mechanism? N1 mechanism. B) The mechanism is a concerted. C) The mechanism proceeds through a radical intermediate. D) The mechanism is an E2 mechanism." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  The mechanism is an SN1 mechanism.
B)  The mechanism is a concerted.
C)  The mechanism proceeds through a radical intermediate.
D)  The mechanism is an E2 mechanism.E) None of the above
F) A) and C)

Question 2

Choose the statement below that is not true about the Suzuki reaction.

Accepted Answer

A)  The product of the Suzuki reaction is completely stereospecific.
B)  The Suzuki reaction involves both an organoborane reagent and an organopalladium catalyst.
C)  The Suzuki reaction forms more highly substituted alkenes.
D)  The Suzuki reaction involves an oxidative addition followed by a reductive elimination.E) All of the above
F) A) and C) C

Question 3

What reactant would be necessary to produce the product indicated in the following reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and C)
F) A) and B)

Question 4

Which of the following statements is not true about a carbene?

Accepted Answer

A)  A carbene is a neutral reactive intermediate.
B)  A carbene contains a divalent carbon.
C)  A carbene is sp3 hybridized.
D)  A carbene is surrounded by six electrons.E) A) and C)
F) C) and D)

Question 5

Starting with chloroform,what reactions order and reagents are necessary to produce the following product and its enantiomer? 3) 3,[2] trans-2-butene B) [1] KOC(CH3) 3,[2] cis-2-butene C) [1] trans-2-butene,[2] KOC(CH3) 3 D) [1] cis-2-butene,[2] KOC(CH3) 3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  [1] KOC(CH3) 3,[2] trans-2-butene
B)  [1] KOC(CH3) 3,[2] cis-2-butene
C)  [1] trans-2-butene,[2] KOC(CH3) 3
D)  [1] cis-2-butene,[2] KOC(CH3) 3E) A) and B)
F) A) and C)

Question 6

Organocuprate reagents (R2CuLi) react with several compounds.Which listed reaction is not correct?

Accepted Answer

A)  Acid chlorides react with organocuprate reagents to form ketones.
B)  Epoxides react with organocuprate reagents to form alcohols.
C)  Alkyl halides react with organocuprate reagents to form coupling products containing a new carbon-carbon bond.
D)  Carbon dioxide reacts with organocuprate reagents to form carboxylic acids.E) All of the above
F) None of the above

Question 7

What is the major organic product of the following reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) B) and D)
F) B) and C)

Question 8

Identify the products of the following reaction.

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and D)
F) None of the above

Question 9

Identify the major organic product of the following reaction.

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) All of the above
F) C) and D) B

Question 10

Starting with chloroform,what reactions order and reagents are necessary to produce the following product? 3) 3,[2] trans-2-butene B) [1] KOC(CH3) 3,[2] cis-2-butene C) [1] trans-2-butene,[2] KOC(CH3) 3 D) [1] cis-2-butene,[2] KOC(CH3) 3" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  [1] KOC(CH3) 3,[2] trans-2-butene
B)  [1] KOC(CH3) 3,[2] cis-2-butene
C)  [1] trans-2-butene,[2] KOC(CH3) 3
D)  [1] cis-2-butene,[2] KOC(CH3) 3E) A) and D)
F) All of the above

Question 11

What is the name for the type of intermediate X formed in the reaction sequence below?

Accepted Answer

A)  A carbocation
B)  A carbanion
C)  A free radical
D)  A carbeneE) B) and C)
F) A) and B)

Question 12

Identify the major organic product of the following reaction.

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and C)
F) A) and D)

Question 13

Coupling reactions with vinyl halides are stereospecific.Which choice below best describes the expected product when trans-1-bromo-1-hexene reacts with (CH3) 2CuLi?

Accepted Answer

A)  The reaction will only yield a trans-alkene.
B)  The reaction will only yield a cis-alkene.
C)  The reaction will only yield one enantiomeric product with R configuration.
D)  The reaction will only yield one enantiomeric product with S configuration.E) None of the above
F) C) and D)

Question 14

What is the major organic product of the following reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) None of the above
F) A) and D)

Question 15

What products are formed when diazomethane is heated?

Accepted Answer

A)  Methane gas and nitrogen gas
B)  Propene gas and nitrogen gas
C)  Methyl radical and nitrogen gas
D)  Methylene and nitrogen gasE) All of the above
F) A) and B)

Question 16

Dichlorocarbene reacts with an alkene to form a cyclopropane derivative.In this reaction the dichlorocarbene acts as a(n)

Accepted Answer

A)  Lewis base.
B)  electrophile.
C)  nucleophile.
D)  Brønsted-Lowry base.E) C) and D)
F) B) and D)

Question 17

What is the major organic product of the following reaction?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and D)
F) B) and C) D

Question 18

Which of the following is true about the use of the Grubbs catalyst?

Accepted Answer

A)  The Grubbs catalyst is used in carbon-carbon coupling reactions.
B)  The Grubbs catalyst is used in alkene metathesis.
C)  The Grubbs catalyst is used in carbene formation.
D)  The Grubbs catalyst is used with palladium as a co-catalyst.E) None of the above
F) A) and D)

Question 19

Identify the starting material that would be used to form the following product in a ring-closing metathesis reaction utilizing a Grubbs catalyst?

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) All of the above
F) A) and C)

Question 20

Identify the structure of the major organic product that results from the following reaction.

Accepted Answer

A)  I
B)  II
C)  III
D)  IVE) A) and C)
F) All of the above

Exam 24: Carbon-Carbon Bond-Forming Reactions in Organic Synthesis

As shown below,when cis-2-butene reacts with dichlorocarbene,only the cis-1,1-dichloro-2,3-dimethylcyclopropane is formed.What can we conclude about the nature of the reaction mechanism?

Correct AnswerverifiedShow Answer

Choose the statement below that is not true about the Suzuki reaction.

Correct AnswerverifiedC

What reactant would be necessary to produce the product indicated in the following reaction?

Correct AnswerverifiedShow Answer

Which of the following statements is not true about a carbene?

Correct AnswerverifiedShow Answer

Starting with chloroform,what reactions order and reagents are necessary to produce the following product and its enantiomer?

Correct AnswerverifiedShow Answer

Organocuprate reagents (R2CuLi) react with several compounds.Which listed reaction is not correct?

Correct AnswerverifiedShow Answer

What is the major organic product of the following reaction?

Correct AnswerverifiedShow Answer

Identify the products of the following reaction.

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Identify the major organic product of the following reaction.

Correct AnswerverifiedB

Starting with chloroform,what reactions order and reagents are necessary to produce the following product?

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What is the name for the type of intermediate X formed in the reaction sequence below?

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Identify the major organic product of the following reaction.

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Coupling reactions with vinyl halides are stereospecific.Which choice below best describes the expected product when trans-1-bromo-1-hexene reacts with (CH3) 2CuLi?

Correct AnswerverifiedShow Answer

What is the major organic product of the following reaction?

Correct AnswerverifiedShow Answer

What products are formed when diazomethane is heated?

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Dichlorocarbene reacts with an alkene to form a cyclopropane derivative.In this reaction the dichlorocarbene acts as a(n)

Correct AnswerverifiedShow Answer

What is the major organic product of the following reaction?

Correct AnswerverifiedD

Which of the following is true about the use of the Grubbs catalyst?

Correct AnswerverifiedShow Answer

Identify the starting material that would be used to form the following product in a ring-closing metathesis reaction utilizing a Grubbs catalyst?

Correct AnswerverifiedShow Answer

Identify the structure of the major organic product that results from the following reaction.

Correct AnswerverifiedShow Answer

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C

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Organocuprate reagents (R₂CuLi) react with several compounds.Which listed reaction is not correct?

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B

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Coupling reactions with vinyl halides are stereospecific.Which choice below best describes the expected product when trans-1-bromo-1-hexene reacts with (CH₃) ₂CuLi?

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D

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