Discussion
Tropone is an example of
Answer: E
Tropone is a non-benzenoid aromatic compound.
Tropone (cycloheptatrienone) is a seven-membered carbon ring with three C=C bonds and a C=O group. The polarised carbonyl puts a partial positive charge on the ring, which then behaves like the tropylium cation, a planar ring with 6 π electrons that satisfies Huckel's 4n + 2 rule. It is aromatic without containing a benzene ring.
It is not heterocyclic (all ring atoms are carbon), not acyclic, and not benzenoid. 'Alicyclic' is the term for non-aromatic rings.
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