Filters
Question type
Study Flashcards

Starting with chloroform, what reactions order and reagents are necessary to produce the following product and its enantiomer? Starting with chloroform, what reactions order and reagents are necessary to produce the following product and its enantiomer? A) [1] KOC(CH<sub>3</sub>) <sub>3</sub>,[2] trans-2-butene B) [1] KOC(CH<sub>3</sub>) <sub>3</sub>,[2] cis-2-butene C) [1] trans-2-butene, [2] KOC(CH<sub>3</sub>) <sub>3</sub> D) [1] cis-2-butene, [2] KOC(CH<sub>3</sub>) <sub>3</sub>


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) 3

E) A) and B)
F) None of the above

Correct Answer

verifed

verified

Organocuprate reagents (R2CuLi) react with several compounds. Which listed reaction isnot correct?


A) Carbon dioxide reacts with organocuprate reagents to form carboxylic acids.
B) Acid chlorides react with organocuprate reagents to form ketones.
C) Epoxides react with organocuprate reagents to form alcohols.
D) Alkyl halides react with organocuprate reagents to form coupling products containing a new carbon-carbon bond.

E) A) and C)
F) None of the above

Correct Answer

verifed

verified

Which of the following statements isnot true about a carbene?


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

E) C) and D)
F) B) and C)

Correct Answer

verifed

verified

Which of the following isnot a step in the Suzuki reaction?


A) Transfer of the alkyl group from the organoborane to palladium
B) Reductive elimination of R-R, forming the new C-C bond
C) Oxidative addition of R-X to the palladium catalyst
D) Substitution of the R group to the palladium catalyst

E) B) and C)
F) All of the above

Correct Answer

verifed

verified

Why is the Grubbs catalyst synthetically important?


A) Because it provides a synthetic pathway for ring-closing metathesis reactions
B) Because it produces only stereoselective products
C) Because it produces only stereospecific products
D) Because it only requires dilute concentrations of the reactants

E) B) and C)
F) None of the above

Correct Answer

verifed

verified

Choose the statement below that isnot true about the Suzuki reaction.


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

E) A) and D)
F) C) and D)

Correct Answer

verifed

verified

Starting with chloroform, what reactions order and reagents are necessary to produce the following product? Starting with chloroform, what reactions order and reagents are necessary to produce the following product? A) [1] trans-2-butene, [2] KOC(CH<sub>3</sub>) <sub>3</sub> B) [1] KOC(CH<sub>3</sub>) <sub>3</sub>,[2] cis-2-butene C) [1] cis-2-butene, [2] KOC(CH<sub>3</sub>) <sub>3</sub> D) [1] KOC(CH<sub>3</sub>) <sub>3</sub>,[2] trans-2-butene


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

E) B) and D)
F) A) and C)

Correct Answer

verifed

verified

Which of the following descriptions doesnot apply to methylene?


A) Methylene is a radical intermediate.
B) The formula of methylene is :CH2.
C) Methylene is a neutral, reactive intermediate.
D) Methylene is sp2 hybridized.

E) B) and C)
F) All of the above

Correct Answer

verifed

verified

A

What is the major product of the following reaction? What is the major product of the following reaction? A) III B) I C) IV D) II


A) III
B) I
C) IV
D) II

E) B) and C)
F) All of the above

Correct Answer

verifed

verified

D

What is the appropriate sequence of reagents that will produce the target molecule shown below from ethylbenzene? What is the appropriate sequence of reagents that will produce the target molecule shown below from ethylbenzene? A) (1) H<sub>2</sub>SO<sub>4</sub>(aq.) , D ; (2) MCPBA; (3) CHBr<sub>3</sub>, KO(CH<sub>3</sub>) <sub>3</sub> ; (4) CH<sub>2</sub>=CPh<sub>2</sub> B) (1) HBr, H<sub>2</sub>O<sub>2</sub>; (2) KOC(CH<sub>3</sub>) <sub>3</sub> ; (3) MCPBA; (4) CH<sub>2</sub>=CPh<sub>2</sub> C) (1) Br<sub>2</sub>, FeBr<sub>3</sub> ; (2) MCPBA; (3) CHBr<sub>3</sub>, KO(CH<sub>3</sub>) <sub>3</sub> ; (4) Ph<sub>2</sub>COCl D) (1) NBS, hn ; (2) KOC(CH<sub>3</sub>) <sub>3</sub> ; (3) CHBr<sub>3</sub>, KO(CH<sub>3</sub>) <sub>3</sub> ; (4) a. LiCuPh<sub>2</sub>, b. H<sub>2</sub>O


A) (1) H2SO4(aq.) , D ; (2) MCPBA; (3) CHBr3, KO(CH3) 3 ; (4) CH2=CPh2
B) (1) HBr, H2O2; (2) KOC(CH3) 3 ; (3) MCPBA; (4) CH2=CPh2
C) (1) Br2, FeBr3 ; (2) MCPBA; (3) CHBr3, KO(CH3) 3 ; (4) Ph2COCl
D) (1) NBS, hn ; (2) KOC(CH3) 3 ; (3) CHBr3, KO(CH3) 3 ; (4) a. LiCuPh2, b. H2O

E) None of the above
F) B) and D)

Correct Answer

verifed

verified

Which statement below best explains what is meant by the statement, "An organocuprate reaction with a vinyl halide is stereospecific"?


A) The reaction of a vinyl halide with the R2CuLi reagent will only yield thecis product.
B) The reaction of a specific stereoisomer with the R2CuLi reagent will yield that particular stereoisomer as the product.
C) The reaction of a vinyl halide with the R2CuLi reagent will only yield one enantiomer product-eitherR orS configuration.
D) The reaction of a vinyl halide with the R2CuLi reagent will only yield thetrans product.

E) C) and D)
F) A) and C)

Correct Answer

verifed

verified

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? 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? A) The mechanism is an S<sub>N</sub>1 mechanism. B) The mechanism proceeds through a radical intermediate. C) The mechanism is a concerted. D) The mechanism is an E2 mechanism.


A) The mechanism is an SN1 mechanism.
B) The mechanism proceeds through a radical intermediate.
C) The mechanism is a concerted.
D) The mechanism is an E2 mechanism.

E) A) and B)
F) A) and C)

Correct Answer

verifed

verified

Many of the reactions studied in this chapter are stereospecific. Why are stereospecific reactions important?


A) All of the choices are true.
B) Often stereoisomers of a particular compound will have very different biological effects on an organism. Only one isomer is biologically helpful, and the other may be harmful.
C) When a reaction produces a mixture of enantiomers, it is often very difficult to separate them. A mixture of products is often not useful.
D) Often only one stereoisomer is biologically active, and coupling reactions are often used for the production of biological materials.

E) None of the above
F) A) and B)

Correct Answer

verifed

verified

A

Showing 1 - 13 of 13

Related Exams

Exam 1

Acids, Bases, Structure and Bonding

13 Questions

Exam 2

Introduction to Organic Molecules and Functional Groups

10 Questions

Exam 3

Alkanes

11 Questions

Exam 4

Stereochemistry

8 Questions

Exam 5

Understanding Organic Reactions

16 Questions

Exam 6

Alkyl Halides and Nucleophilic Substitution

11 Questions

Exam 7

Alkyl Halides and Elimination Reactions

9 Questions

Exam 8

Alcohols, Ethers, and Related Compounds

9 Questions

Exam 9

Alkenes Andalkynes

24 Questions

Exam 10

Oxidation and Reduction

6 Questions

Exam 11

Conjugation, Resonance, and Dienes

9 Questions

Exam 12

Introduction to Carbonyl Chemistry; Organometallic Reagents; Oxidation and Reduction

14 Questions

Exam 13

Aldehydes and Ketones-Nucleophilic Addition

18 Questions

Exam 14

Carboxylic Acids and Nitriles

11 Questions

Exam 15

Carboxylic Acids and Their Derivatives-Nucleophilic Acyl Substitution

19 Questions

Exam 16

Substitution Reactions of Carbonyl Compounds at the Α Carbon

12 Questions

Exam 17

Carbonyl Condensation Reactions

13 Questions

Exam 18

Benzene and Aromatic Compounds

10 Questions

Exam 19

Reactions of Aromatic Compounds

12 Questions

Exam 20

Radical Reactions

15 Questions

Exam 21

Amines

16 Questions

Exam 22

Amino Acids and Proteins

11 Questions

Exam 23

Carbohydrates

8 Questions

Exam 24

Lipids

7 Questions

Exam 25

Nucleic Acids and Protein Synthesis

18 Questions

Exam 26

Metabolism

18 Questions

Exam 28

Pericyclic Reactions, and Synthetic Polymers

23 Questions

Exam 29

Spectroscopy : Mass Spectrometry, Infrared Spectroscopy, and Nuclear Magnetic Resonance Spectroscopy

12 Questions

Show Answer