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JEE Advanced levelSingle correct optionDifficulty 3 of 3g1159

The total number of $π$ electrons in anthracene and the value of $n$ in Huckel's $4 n + 2$ relation are respectively

A14 and 2
B12 and 3
C16 and 3
D14 and 3

Answer: D

Anthracene has fourteen sp2 carbons in three linearly fused rings, hence 7 C=C bonds and 14 pi electrons.

14 = 4 n + 2

gives

n = 3

, so it obeys Huckel's rule.

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