Aromatic Compounds: Structure, Properties, and Reactions

Question 1

Which of the following groups is a strongly deactivating group in electrophilic aromatic substitution reactions?

Accepted Answer

-NO2

Answer

-NH2

Answer

-COOH

Answer

-CH3

Question 2

What is the name of the reaction that converts an aromatic ring into a cyclohexene ring?

Accepted Answer

Birch reduction

Answer

Diels-Alder reaction

Answer

Friedel-Crafts alkylation

Answer

Wittig reaction

Question 3

Which of the following compounds is an example of a heteroaromatic compound?

Accepted Answer

Pyridine

Answer

Benzene

Answer

Naphthalene

Answer

Anthracene

Question 4

What is the mechanism of the nitration of benzene?

Accepted Answer

Electrophilic substitution

Answer

Electrophilic addition

Answer

Nucleophilic addition

Answer

Nucleophilic substitution

Question 5

What is the IUPAC name of the compound C6H5CH2Br?

Accepted Answer

Benzyl bromide

Answer

Bromomethylbenzene

Answer

1-Bromo-2-phenylethane

Answer

2-Bromomethylbenzen

Question 6

Which property is characteristic of aromatic compounds?

Accepted Answer

Planarity

Answer

Low reactivity

Answer

High reactivity

Answer

Non-polarity

Question 7

What is the product of the Friedel-Crafts acylation of benzene with acetyl chloride (CH3COCl)?

Accepted Answer

Acetophenone

Answer

Phenylethanone

Answer

Acetylene

Answer

Benzene carboxylic acid

Question 8

Which reagent is used to reduce an aromatic nitro group to an amino group?

Accepted Answer

H2/Pd

Answer

LiAlH4

Answer

NaBH4

Answer

KMnO4

Question 9

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 10

What is a defining characteristic of aromatic compounds?

Accepted Answer

Flat, cyclic structure with alternating double bonds

Answer

High reactivity due to numerous double bonds

Answer

Aliphatic side chains attached to the ring

Question 11

Identify the reaction classified as electrophilic aromatic substitution:

Accepted Answer

Nitration of benzene

Answer

Addition of H2 to benzene

Answer

Oxidation of benzene

Answer

Hydrolysis of an ester

Question 12

In a nitration reaction, the electrophile is:

Accepted Answer

NO2+

Answer

NO+

Answer

H+

Answer

OH+

Question 13

Predict the major product of this reaction:

Accepted Answer

p-Nitrotoluene

Answer

o-Nitrotoluene

Answer

m-Nitrotoluene

Answer

2,4-Dinitrotoluene

Question 14

Which of these compounds is not aromatic?

Accepted Answer

Cyclohexene

Answer

Benzene

Answer

Naphthalene

Answer

Pyridine

Question 15

The Friedel-Crafts acylation reaction primarily serves to:

Accepted Answer

Introduce an acyl group (-COR) into an aromatic ring

Answer

Introduce an alkyl group into an aromatic ring

Answer

Reduce an aromatic ring

Answer

Oxidize an aromatic ring

Question 16

In the Friedel-Crafts alkylation reaction, which catalyst is commonly employed?

Accepted Answer

AlCl3

Answer

H2SO4

Answer

NaOH

Answer

Pd/C

Question 17

Classify the Diels-Alder reaction as a type of organic reaction:

Accepted Answer

Cycloaddition reaction

Answer

Electrophilic aromatic substitution reaction

Answer

Nucleophilic addition reaction

Answer

Radical reaction

Question 18

The Friedel-Crafts acylation reaction proceeds via which reaction mechanism?

Accepted Answer

Electrophilic aromatic substitution

Answer

Radical aromatic substitution

Answer

Pericyclic aromatic substitution

Answer

Nucleophilic aromatic substitution

Question 19

Provide the IUPAC name for the compound with the formula C6H5CH2COOH.

Accepted Answer

2-Phenylethanoic acid

Answer

2-Carboxytoluene

Answer

Benzeneacetic acid

Answer

Phenylethylene carboxylic acid

Question 20

Which reaction is employed to synthesize aromatic aldehydes?

Accepted Answer

Gattermann-Koch reaction

Answer

Friedel-Crafts acylation

Answer

Wittig reaction

Question 21

In the reaction of benzene with nitric acid and sulfuric acid, what is the primary product obtained?

Accepted Answer

Nitrobenzene

Answer

Trinitrobenzene

Answer

Phenol

Answer

Dinitrobenzene

Question 22

Which of the following compounds is classified as a polycyclic aromatic hydrocarbon (PAH)?

Accepted Answer

Naphthalene

Answer

Toluene

Answer

Benzene

Answer

Phenol

Question 23

The carbon atoms in the benzene ring exhibit which type of hybridization?

Accepted Answer

sp2

Answer

sp

Answer

sp3d

Answer

sp3