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Huckel's Rule

Huckel's Rule

18. Aromaticity / Huckel's Rule / Problem 2

Determine whether the cation shown below is aromatic, antiaromatic, or nonaromatic. If it is aromatic, calculate its n from Hückel's rule. If not, explain how it violates the aromaticity requirements.

ANSWERS OPTIONS

A

The cation nonaromatic since its n= 1/2

B

The cation is aromatic. Its n is 1.

C

The molecule is antiaromatic. It is cyclic, planar and conjugated, but it has 4n electrons.

D

The molecule is nonaromatic. It violates all the Huckel's rule.

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