Consider the highly stable fused-ring aromatic hydrocarbon anthracene (), which consists of three li — GOC and Organic Chemistry Basics Chemistry Question
Question
Consider the highly stable fused-ring aromatic hydrocarbon anthracene ($C_{14}H_{10}$), which consists of three linearly fused benzene rings. What is the calculated integer value of '$n$' when applying Huckel's $(4n+2)$ rule to its peripheral $\pi$ -electron system?
Answer: 3
💡 Solution & Explanation
Anthracene has 14 $\pi$ -electrons delocalized across its conjugated framework. Applying Huckel's rule: $4n + 2 = 14 \implies 4n = 12 \implies n = 3$. Because $n$ is an integer, anthracene satisfies the condition for aromaticity.
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