Electrophilic Substitution Reactions of Benzene

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Which of the following is the most likely electrophile in the nitration of benzene? *

2 points

(a) NO₂⁺

(b) NO₃⁻

(d) HSO₄⁻

What is the role of FeBr₃ in the bromination of benzene?
*

2 points

(a) It acts as a base.

(b) It acts as a catalyst.

(d) It acts as a nucleophile

Which of the following is NOT an electrophilic aromatic substitution reaction?

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2 points

(a) Nitration

(b) Halogenation

(d) Hydrogenation

In the sulfonation of benzene, what is the electrophile?

*

2 points

(a) SO₃⁺

(b) H₂SO₄

(d) HSO₃

Which of the following groups is considered an activating group in electrophilic aromatic substitution?

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2 points

(a) -NO₂

(b) -COOH

(d) -CN

Which of the following is the rate-determining step in electrophilic aromatic substitution?

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2 points

(a) Formation of the electrophile

(b) Attack of the electrophile on the benzene ring

(d) Reaction of the catalyst with the benzene ring

What is the major product of the reaction between benzene and methyl chloride in the presence of AlCl₃?

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2 points

(a) Chlorobenzene

(b) Toluene

(d) None of the above

What is the role of concentrated sulfuric acid in the nitration of benzene?

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2 points

(a) It acts as a solvent.

(b) It acts as a catalyst.

(d) It acts as a nucleophile

Which of the following is an example of a deactivating group in electrophilic aromatic substitution?

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2 points

(a) -OH

(b) -NH₂

(d) -CF ₃

Which of the following statements is correct about electrophilic aromatic substitution?

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2 points

(a) It is a nucleophilic substitution reaction.

(b) The benzene ring retains its aromaticity throughout the reaction.

(d) It is a slow reaction

Which of the following substituents are all meta-directing in electrophilic substitution reactions?

2 points

−𝐶𝑙, −𝑁𝐻2, −𝐶𝐻3

−𝐶𝑁, −𝑆𝑂3𝐻, −𝐶𝐻𝑂

−𝐶𝑂𝐶𝐻3, −𝐶𝑂𝑁𝑅2, −𝑁𝐻2

−𝑂𝐶𝑂𝐶𝐻3, −𝑂𝐻, −𝐶𝑁

What is the role of a Lewis acid catalyst in the halogenation of benzene?

2 points

a) To produce a nucleophile

b) To increase the rate of reaction

c) To generate the electrophile

d) To accept electrons

Which of the following statements about electrophiles in electrophilic substitution reactions is not true?

2 points

a) Electrophiles are electron deficient species.

b) Electrophiles can be positively or negatively charged species with vacant orbitals.

c) Electrophiles accept electrons, acting as Lewis acids.

d) The most electron-populated part of a nucleophile attacks electrophiles.

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