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Huckel's rule states that for aromaticity there must be (4n + 2) π electrons present in a compound, where n is an integer. Which of the following compounds satisfies this rule?

1. Cyclobutadiene
2. Benzene
3. Cyclooctatetraene
4. Cyclopentadienyl anion

Correct answer: Benzene

Solution

Benzene has 6 π electrons, which satisfies Huckel's rule (4n + 2, where n = 1). The other compounds either do not meet the (4n + 2) condition or are not aromatic.

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