Question 1

Which of the following statements best explains why benzene does not undergo typical addition reactions with HX or X$$_2$$ under mild conditions, unlike cyclohexene?

Accepted Answer

Benzene is stabilized by aromaticity, which would be lost in an addition reaction.

Question 2

Which of the following compounds is aromatic according to Huckel’s Rule?

Accepted Answer

Benzene

Question 3

What is the correct IUPAC name for the compound shown below?

![$$image_3$$]

Accepted Answer

4-Amino-2-iodotoluene (p-aminotoluene, o-iodo)

Question 4

Which of the following best describes the aromaticity of the compound shown below?

![$$image_2$$]

Accepted Answer

Non-aromatic

Question 5

Which of the following is the correct order of stability for the following compounds: benzene, cyclobutadiene, and 1,3,5-hexatriene?

Accepted Answer

Benzene \u003e 1,3,5-hexatriene \u003e Cyclobutadiene

Question 6

Which of the following is NOT a requirement for a molecule to be aromatic?

Accepted Answer

The molecule must have an even number of carbon atoms.

Question 7

How many $$\pi$$ electrons are present in the cyclopentadienyl anion?

Accepted Answer

$$6$$

Question 8

Which of the following annulenes is aromatic?

Accepted Answer

[10]Annulene

Question 9

Which of the following heterocycles is aromatic and contains a nitrogen atom that does NOT donate a lone pair to the aromatic system?

Accepted Answer

Pyridine

Question 10

Which of the following statements about the acidity of aromatic hydrocarbons is correct?

Accepted Answer

Cyclopentadiene is unusually acidic because its conjugate base is aromatic.

Question 11

Which of the following best describes the basicity of the lone pairs in imidazole?

Accepted Answer

Only the lone pair not involved in aromaticity is basic.

Question 12

Which of the following molecules would most readily react with an electrophile at the 5-membered ring?

![$$image_27$$]

Accepted Answer

The 5-membered ring

Question 13

Which of the following best explains why [8]annulene is non-aromatic while its dianion is aromatic?

Accepted Answer

[8]Annulene is non-planar, but the dianion is planar and has $$10$$ $$\pi$$ electrons.

Question 14

Which of the following is the correct name for the compound shown below?

![$$image_4$$]

Accepted Answer

1,2-Dimethylbenzene (o-xylene)

Question 15

Which of the following is a common name for the heterocycle shown below?

![$$image_21$$]

Accepted Answer

Furan

Question 16

Which of the following best describes the effect of aromaticity on the reactivity of benzene compared to 1,3,5-hexatriene?

Accepted Answer

Benzene is less reactive toward addition reactions due to aromatic stabilization.

Question 17

Which of the following is true regarding the planarity of annulenes?

Accepted Answer

Planarity depends on ring size and substitution; larger annulenes may be non-planar.

Question 18

Which of the following is the correct order of aromaticity for the following compounds: benzene, cyclobutadiene, cyclooctatetraene?

Accepted Answer

Benzene \u003e Cyclooctatetraene \u003e Cyclobutadiene

Question 19

Which of the following is a requirement for a heteroatom to donate a lone pair to aromaticity in a heterocycle?

Accepted Answer

The heteroatom must be sp3 hybridized and donation must help create aromaticity.

Aromatic Compounds: Structure, Stability, and Nomenclature

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