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Q.
Which of the following is non-aromatic in nature?
Hydrocarbons
Solution:
a. $10 \pi \bar{e}^{\prime} s$ in delocalisation $\Rightarrow$ Aromatic
b. $10 \pi \bar{e}^{\prime}$ sin delocalisation, but is non-aromatic because ring is non-planar, as the $H$ atoms that point to the interior to the ring interfere with each other
Note: Annulene with $10 C$ and $14 C$ are $n$ on - aromatic, but dehydro [10] and [14] annulenes are aromatic
in delocalisation (only one lone pair is delocalised) $\Rightarrow$ Aromatic
in delocalisation $⇒$ Aromatic
