Which of the following is non-aromatic?

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Question

(D) Aromatic compounds must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and cyclic. $Pyrrole$,$Thiophene$,and $Furan$ are all five-membe

Vedclass · Accepted Answer

Pyran

Vedclass · Answer

(D) Aromatic compounds must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,and cyclic. $Pyrrole$,$Thiophene$,and $Furan$ are all five-membered heterocyclic aromatic compounds with $6$ $\pi$ electrons $(n=1)$. $Pyran$ $(C_5H_6O)$ contains an $sp^3$ hybridized carbon atom in the ring,which breaks the continuous conjugation required for aromaticity. Therefore,$Pyran$ is non-aromatic.

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