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Q. Which among the following is a non-benzenoid aromatic compound?

KVPYKVPY 2017Organic Chemistry – Some Basic Principles and Techniques

Solution:

Non-benzenoid aromatic compounds are those compounds which do not have benzene ring. They exhibit aromaticity due to alternate $\pi$ bonds in the molecule. The structure of compounds given in options are as follows :
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Thus, thiophene is a non benzenoid compound