The polycyclic aromatic hydrocarbon Anthracene () consists of three fused benzene rings. According to Huckel's electron rule, what is the exact integer value of '' for the fully delocalized peripheral

Question

The polycyclic aromatic hydrocarbon Anthracene ($C_{14}H_{10}$) consists of three fused benzene rings. According to Huckel's $(4n+2)$ $\pi$ electron rule, what is the exact integer value of '$n$' for the fully delocalized peripheral system of Anthracene?

Prashant Kotian · Accepted Answer

Correct answer: 3. Anthracene contains three linearly fused benzenoid rings. The molecule features 7 distinct conjugated double bonds across its planar skeletal framework. Each double bond contributes 2 electrons to the delocalized cyclic cloud, resulting in a total of 14 electrons. Applying Huckel's rule: .

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