Question 1

Which of the following best describes an aromatic hydrocarbon?

Accepted Answer

An unsaturated hydrocarbon with a ring structure and a bonding arrangement that makes it chemically stable

Question 2

Benzene, $$\mathrm{C_6H_6}$$, is often represented as a hexagon with a circle inside. What does the circle indicate?

Accepted Answer

That the electrons in the bonds are shared equally between all 6 carbon atoms

Question 3

Which of the following is the correct IUPAC name for a benzene ring with chlorine atoms at positions 1 and 3, and an ethyl group at position 4?

Accepted Answer

1,3-dichloro-4-ethylbenzene

Question 4

What is the main reason benzene does not undergo addition reactions like typical alkenes?

Accepted Answer

The bonds in benzene are more stable due to electron delocalization

Question 5

A compound is named 3-phenylhexane. Which of the following best describes its structure?

Accepted Answer

A hexane chain with a phenyl group attached to the third carbon

Question 6

Which of the following reactions is characteristic of benzene?

Accepted Answer

Substitution of a hydrogen atom with a halogen

Question 7

What is the product when benzene reacts with chlorine ($$\mathrm{Cl_2$}) in $$the presence of a catalyst?

Accepted Answer

Chlorobenzene and hydrogen chloride

Question 8

Which property is typical of aromatic hydrocarbons like benzene?

Accepted Answer

Volatility and low water solubility

Question 9

Aromatic compounds are often less reactive than alkenes in which type of reaction?

Accepted Answer

Addition reactions

Question 10

Which of the following best explains why all the carbon-carbon bonds in benzene are the same length?

Accepted Answer

The electrons are delocalized and shared equally among all six carbons

Question 11

Which of the following is the correct structure for 1-bromo-2-chloro-4-ethylbenzene?

Accepted Answer

A benzene ring with Br at C1, Cl at C2, and an ethyl group at C4

Question 12

Which of the following statements about toluene is correct?

Accepted Answer

It is a benzene ring with a methyl group attached

Question 13

Which naming convention is used when a benzene ring is attached to a complex hydrocarbon chain?

Accepted Answer

The benzene ring is named as a phenyl group substituent

Question 14

Which of the following best describes the reaction of cyclohexene with chlorine ($$\mathrm{Cl_2$}$$)?

Accepted Answer

An addition reaction producing 1,2-dichlorocyclohexane

Question 15

What is the IUPAC name for paradichlorobenzene?

Accepted Answer

1,4-dichlorobenzene

Question 16

Which of the following best explains why benzene was replaced by other solvents in dry cleaning?

Accepted Answer

Benzene is carcinogenic and poses health risks

Question 17

Which of the following is a correct description of a phenyl group?

Accepted Answer

A benzene ring with one hydrogen atom removed

Question 18

Which of the following is a common misconception about the structure of benzene?

Accepted Answer

That benzene has alternating single and double bonds

Question 19

Which of the following best describes the reaction of benzene with nitric acid ($$\mathrm{$$HNO_3$$}) in $$the presence of a catalyst?

Accepted Answer

A substitution reaction producing nitrobenzene and water

Question 20

Why are aromatic hydrocarbons generally insoluble in water?

Accepted Answer

They are non-polar molecules

Lesson 1.3: Aromatic Hydrocarbons: Structure, Nomenclature, Properties, and Reactions

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