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Q. Which of the following compounds is not aromatic?

JEE MainJEE Main 2022Organic Chemistry – Some Basic Principles and Techniques

Solution:

$[10]$ Annulene, although follow $(4 n+2) \pi$ electron rule, but it is non-aromatic due to its non planar nature. It is nonplanar due to repulsion of $C - H$ bonds present inside the ring.