Question 1

Give the major product for the following E2 reaction. 
A) 
B) 
C) 
D) 
E)

Accepted Answer

A

Question 2

Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product?
A)1-chloropentane
B)2-chloropentane
C)3-chloropentane
D)1-chloro-2-methylbutane
E)1-chloro-3-methylbutane

Accepted Answer

C

Question 3

How many distinct alkene products are possible when the alkyl iodide below undergoes E2 elimination? 
A)1
B)2
C)3
D)4
E)5

Accepted Answer

E

Question 4

Which of the following bases gives the highest anti-Zaitsev product in E2 reactions when reacted with 2-bromo-2, 3-dimethylbutane?
A) 
B) 
C) 
D) 
E)

Accepted Answer

The answer of Which of the following bases gives the...

Question 5

Draw the alkene product which results when 1-bromopentane is heated in acetone containing NaOH. Give a detailed, step-by-step mechanism for the production of this compound.

Accepted Answer

The answer of Draw the alkene product which results when...

Question 6

When 2-bromo-3-methyl-1-phenylbutane is treated with sodium methoxide, why is the major product 3-methyl-1-phenyl-1-butene? A)S_N2 predominates over E2. B)E1 predominates over E2. C)The bulkiness of the methoxide results in the less substituted alkene. D)The newly formed double bond in this compound is conjugated with the phenyl ring. E)The less substituted alkene is always more stable than the more substituted alkene.

Accepted Answer

The major product, 3-methyl-1-phenyl-1-butene, is formed because the newly formed double bond is conjugated with the phenyl ring, which stabilizes the product through resonance.

Question 7

Which of the following halides is most reactive in an E2 reaction with sodium methoxide? A)(CH₃)₃CCH₂I B)(CH₃)₂CHCHICH₃ C)(CH₃)₂CHCH₂Br D)(CH₃)₂CHCH₂Cl E)(CH₃)₂CHCH₂CH₂Cl

Accepted Answer

B) represents a tertiary halide, which is most reactive in an E2 reaction due to the ease of forming a more stable tertiary carbocation intermediate.

Question 8

Which of the following compounds undergoes E2 reactions with the fastest rate? A) B)CH₃CH₂CH₂Cl C)CH₃CH₂CH₂I D) E)CH₃CH₂CH₂Br

Accepted Answer

The answer of Which of the following compounds undergoes E2...

Question 9

What is the major organic product of the following reaction? 
A)2,3-dimethyl-1-hexene
B)2,3-dimethyl-2-hexene
C)2-isopropyl-1-pentene
D)(Z)-2,3-dimethyl-3-hexene
E)(E)-2,3-dimethyl-3-hexene

Accepted Answer

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

Question 10

What is the most reactive alkyl halide for elimination reactions?
A)1-chlorobutane
B)1-fluorobutane
C)1-iodobutane
D)1-bromobutane

Accepted Answer

The reactivity of alkyl halides towards elimination reactions generally increases with increasing size of the halogen atom. This is because larger halogens have weaker bonds to carbon, making it easier for them to be eliminated. Therefore, 1-iodobutane is the most reactive alkyl halide for elimination reactions.

Question 11

Give the major product for the following E2 reaction. 
A) 
B) 
C) 
D) 
E)none of the above

Accepted Answer

The answer of Give the major product for the following...

Question 12

What is the major organic product of the following reaction? 
A)2,3-dimethyl-1-hexene
B)2,3-dimethyl-2-hexene
C)2-isopropyl-1-pentene
D)(Z)-2,3-dimethyl-3-hexene
E)(E)-2,3-dimethyl-3-hexene

Accepted Answer

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

Question 13

Which of the following halides is least reactive in an E2 reaction with sodium methoxide? A)(CH₃)₃CCH₂I B)(CH₃)₂CHCHICH₃ C)(CH₃)₂CHCH₂Br D)(CH₃)₂CHCH₂Cl E)(CH₃)₂CHCH₂CH₂Cl

Accepted Answer

The answer of Which of the following halides is least...

Question 14

Which of the following are the elimination products of the reaction shown below? CH₃CH₂Br + ^-OH → ? A)CH₃CH₂Br⁺H + O^- B)HOCH₂CH₂Br C)CH₃CH₂OH + Br^- D)CH₂ CH₂ + Br^- + H₂O E)CH₂ CHBr + H₂O

Accepted Answer

The answer of Which of the following are the elimination...

Question 15

Give the mechanism of the reaction shown below.

Accepted Answer

The answer of Give the mechanism of the reaction shown...

Question 16

Which alkyl halide reacts the fastest in an E2 reaction?
A)2-chloro-2-methylbutane
B)1-chlorobutane
C)1-chloro-2-methylbutane
D)2-chlorobutane
E)chloromethane

Accepted Answer

2-chloro-2-methylbutane reacts the fastest in an E2 reaction because it is a tertiary alkyl halide, which provides the most stable alkene product through the elimination process.

Question 17

Give the mechanism of the reaction shown below.

Accepted Answer

The answer of Give the mechanism of the reaction shown...

Question 18

What is the major product of the following E2 reaction? A) B)CH₃CH₂CH CH₂ C) D) E)

Accepted Answer

The E2 reaction involves the elimination of a leaving group and a proton in a single step, resulting in the formation of a double bond. In this case, the leaving group is the bromine atom, and the proton that is eliminated is the one on the carbon adjacent to the leaving group. The product will be the alkene that is formed as a result of this elimination. Choice C shows the correct alkene product that should result from the elimination of the bromine and proton from the given starting material.

Question 19

Give the major product for the E2 reaction. 
A) 
B) 
C) 
D) 
E)

Accepted Answer

The answer of Give the major product for the E2...

Question 20

Which of the following statements is true concerning the E2 reactions of alkyl fluorides? A)Alkyl fluorides react more readily in E2 reactions than do alkyl iodides. B)The transition state of this E2 reaction resembles a carbanion rather than an alkene. C)The C-F bond is the weakest carbon-halogen bond so S_N2 will always predominate over E2 in the reactions of alkyl fluorides. D)Alkyl fluorides react to form the most stable carbocation intermediate. E)Alkyl fluorides cannot adopt the proper stereochemical alignment for an E2 reaction to occur.

Accepted Answer

The answer of Which of the following statements is true...

Quiz 10: Elimination Reactions of Alkyl Halides Competition Between Substitution and Elimination

Give the major product for the following E2 reaction.

Which of the alkyl chlorides listed below undergoes dehydrohalogenation in the presence of a strong base to give 2-pentene as the only alkene product?

How many distinct alkene products are possible when the alkyl iodide below undergoes E2 elimination?

Which of the following bases gives the highest anti-Zaitsev product in E2 reactions when reacted with 2-bromo-2, 3-dimethylbutane?

Draw the alkene product which results when 1-bromopentane is heated in acetone containing NaOH. Give a detailed, step-by-step mechanism for the production of this compound.

When 2-bromo-3-methyl-1-phenylbutane is treated with sodium methoxide, why is the major product 3-methyl-1-phenyl-1-butene?

Which of the following halides is most reactive in an E2 reaction with sodium methoxide?

Which of the following compounds undergoes E2 reactions with the fastest rate?

What is the major organic product of the following reaction?

What is the most reactive alkyl halide for elimination reactions?

Give the major product for the following E2 reaction.

What is the major organic product of the following reaction?

Which of the following halides is least reactive in an E2 reaction with sodium methoxide?

Which of the following are the elimination products of the reaction shown below? CH3CH2Br + -OH → ?

Give the mechanism of the reaction shown below.

Which alkyl halide reacts the fastest in an E2 reaction?

Give the mechanism of the reaction shown below.

What is the major product of the following E2 reaction?

Give the major product for the E2 reaction.

Which of the following statements is true concerning the E2 reactions of alkyl fluorides?

Which of the following are the elimination products of the reaction shown below? CH₃CH₂Br + ^-OH → ?