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JEE Main levelSingle correct optionDifficulty 2 of 3g1139

Naphthalene is aromatic because it contains

A10 $π$ electrons, $4 n$ with $n = 2.5$
B10 $π$ electrons, $4 n + 2$ with $n = 2$
C8 $π$ electrons, $4 n$ with $n = 2$
D12 $π$ electrons, $4 n + 2$ with $n = 3$

Answer: B

Naphthalene has five C=C bonds in its fused planar framework, hence 10 pi electrons.

10 = 4 (2) + 2

, so Huckel's rule is obeyed with

n = 2

.

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