Question 1

Which of the following statements best explains why benzene is unusually unreactive toward addition reactions compared to alkenes?

Accepted Answer

Benzene's $$\pi$$ electrons are delocalized across the ring, creating extra stability and resistance to addition reactions.

Question 2

Which of the following is NOT a criterion for aromaticity according to Hückel's rule?

Accepted Answer

The molecule must have only single bonds.

Question 3

What is the correct IUPAC name for the following compound: a benzene ring with a methyl group at position 1 and a nitro group at position 3?

Accepted Answer

m-nitrotoluene

Question 4

Which of the following best describes the bonding in benzene?

Accepted Answer

Benzene has six $$sp^2$$ hybridized carbons with delocalized $$\pi$$ electrons above and below the ring.

Question 5

Which of the following compounds is aromatic?

Accepted Answer

Tropylium cation ($$6\ \pi$$ electrons, planar, conjugated)

Question 6

What is the correct name for a benzene ring with a chlorine at position 1, an ethyl at position 2, and a propyl at position 4?

Accepted Answer

Question 7

Which of the following best explains why benzene is more stable than expected for a molecule with three double bonds?

Accepted Answer

Benzene's resonance hybrid delocalizes electrons, lowering its energy by about 36 kcal/mol compared to three isolated double bonds.

Question 8

Which of the following is the correct classification for a planar, cyclic molecule with 8 $$\pi$$ electrons and complete conjugation?

Accepted Answer

Antiaromatic

Question 9

What is the correct name for the following compound: a benzene ring with a hydroxyl group at position 1 and a nitro group at position 2?

Accepted Answer

o-nitrophenol

Question 10

Which of the following drugs contains a benzene ring as part of its structure?

Accepted Answer

Nexium (esomeprazole)

Question 11

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

Accepted Answer

A benzene ring attached directly to a parent chain, $$C_6H_5-$$

Question 12

Which of the following best describes the difference between ortho-, meta-, and para- isomers of disubstituted benzene?

Accepted Answer

They differ in the relative positions of the two substituents on the benzene ring.

Question 13

Which of the following is the correct classification for a molecule that is cyclic, planar, and conjugated, but has 4 $$\pi$$ electrons?

Accepted Answer

Antiaromatic

Question 14

Which of the following is the correct name for a benzene ring with a tert-butyl group attached?

Accepted Answer

tert-butylbenzene

Question 15

Which of the following statements about the resonance hybrid of benzene is TRUE?

Accepted Answer

The resonance hybrid has all C–C bonds of equal length due to delocalization of $$\pi$$ electrons.

Question 16

Which of the following is the correct name for a benzene ring with a formyl group attached?

Accepted Answer

Benzaldehyde

Question 17

Which of the following best describes why cyclooctatetraene is not aromatic?

Accepted Answer

It is not planar, so its $$\pi$$ orbitals cannot overlap to form a conjugated system.

Question 18

Which of the following is the correct classification for a molecule that is cyclic, planar, and conjugated, but does NOT have $$(4n+2)\ \pi$$ electrons?

Accepted Answer

Antiaromatic

Question 19

Which of the following is the correct name for a benzene ring with a methoxy group attached?

Accepted Answer

Anisole

Benzene and Aromatic Compounds: Structure, Stability, and Nomenclature

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