Aromatic Compounds: Structure, Properties, and Reactions

Question 1

The process by which an aromatic compound reacts with an electrophile is known as:

Accepted Answer

Electrophilic substitution

Answer

Electrophilic addition

Answer

Nucleophilic substitution

Answer

Nucleophilic addition

Question 2

The product of the Friedel-Crafts acylation of benzene with acetyl chloride is:

Accepted Answer

Acetophenone

Answer

Benzoic acid

Answer

Benzaldehyde

Answer

Benzyl acetate

Question 3

Which of the following is a resonance contributor to the benzene molecule?

Accepted Answer

Both Kekule structures

Answer

Kekule structure I

Answer

Kekule structure II

Answer

Neither Kekule structure

Question 4

Which of the following compounds is not aromatic?

Accepted Answer

Cyclohexane

Answer

Naphthalene

Answer

Anthracene

Answer

Furan

Question 5

Which of the following compounds is aromatic?

Accepted Answer

Benzene

Answer

Cyclohexane

Answer

Ethylene

Answer

Acetylene

Question 6

Which of the following is a defining characteristic of aromatic compounds?

Accepted Answer

Exceptional stability

Answer

High reactivity

Answer

Presence of only single bonds

Answer

Ease of forming ions

Question 7

The resonance structures of benzene contribute to its:

Accepted Answer

Increased stability

Answer

Enhanced reactivity

Answer

Greater solubility

Answer

Higher melting point

Question 8

Toluene is a benzene derivative that contains:

Accepted Answer

One methyl group

Answer

Two methyl groups

Answer

Three methyl groups

Answer

No methyl groups

Question 9

The electrophilic substitution of benzene with chlorine forms:

Accepted Answer

Chlorobenzene

Answer

Dichlorobenzene

Answer

Trichlorobenzene

Answer

Tetrachlorobenzene

Question 10

In a Diels-Alder reaction, which species react?

Accepted Answer

A diene and a dienophile

Answer

An alkene and an alkyne

Answer

An aldehyde and a ketone

Answer

A carboxylic acid and an alcohol

Question 11

Which characteristic is unique to aromatic compounds?

Accepted Answer

High stability due to resonance

Answer

High reactivity towards nucleophiles

Answer

Low boiling point and high solubility in water

Answer

Presence of a lone pair on the nitrogen atom

Question 12

What is the hybridization of carbon atoms in the benzene ring?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 13

What is the IUPAC name for the following compound: C6H5CH=CH2?

Accepted Answer

Styrene

Answer

Benzene propene

Answer

Phenylpropene

Answer

Ethylbenzene

Question 14

Which of the following reactions is characteristic of aromatic compounds?

Accepted Answer

Electrophilic aromatic substitution

Answer

Nucleophilic addition

Answer

Free radical polymerization

Answer

Esterification

Question 15

What is the mechanism of the Friedel-Crafts acylation reaction?

Accepted Answer

Electrophilic aromatic substitution

Answer

Nucleophilic addition

Answer

Free radical addition

Answer

Pericyclic reaction

Question 16

What is the resonance energy of benzene?

Accepted Answer

36 kcal/mol

Answer

15 kcal/mol

Answer

45 kcal/mol

Answer

60 kcal/mol

Question 17

Which of the following statements about aromatic compounds is incorrect?

Accepted Answer

They are highly reactive towards electrophiles.

Answer

They are planar and cyclic.

Answer

They contain alternating single and double bonds.

Answer

They exhibit aromatic substitution reactions.

Question 18

Which of the following is a characteristic of aromatic compounds?

Accepted Answer

Resonance stabilization

Answer

High solubility in water

Answer

Low boiling point

Answer

Low reactivity

Question 19

What is the hybridization of each carbon atom in the benzene ring?

Accepted Answer

sp²

Answer

sp

Answer

sp³d

Answer

sp³

Question 20

Which of the following compounds can be classified as an aromatic hydrocarbon?

Accepted Answer

Naphthalene

Answer

Propene

Answer

Ethanol

Answer

Cyclohexane

Question 21

In the nitration of benzene, which species acts as the electrophile?

Accepted Answer

NO₂⁺

Answer

NO₃⁻

Answer

H₂SO₄

Answer

NO

Question 22

What is the name of the reaction between an aromatic compound and a strong oxidizing agent?

Accepted Answer

Combustion

Answer

Nitration

Answer

Sulfonation

Answer

Halogenation

Question 23

What is the hybridization of the nitrogen atom in pyridine?

Accepted Answer

sp²

Answer

sp

Answer

sp³d

Answer

sp³

Question 24

Which of the following compounds is considered a heteroaromatic compound?

Accepted Answer

Furan

Answer

Toluene

Answer

Benzene

Question 25

In the Friedel-Crafts acylation reaction, what is the function of the Lewis acid?

Accepted Answer

Catalyst

Answer

Solvent

Answer

Product

Answer

Reactant