Which of the following is not aromatic?

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(D) compound is said to be aromatic if it is planar,cyclic,fully conjugated,and follows $H$ückel's rule,which states it must have $(4n + 2)$ $\pi$ ele

Vedclass · Accepted Answer

$1,3,5-$heptatriene

Vedclass · Answer

(D) compound is said to be aromatic if it is planar,cyclic,fully conjugated,and follows $H$ückel's rule,which states it must have $(4n + 2)$ $\pi$ electrons in the delocalized system.Benzene,Naphthalene,and Pyridine are all aromatic compounds as they satisfy these conditions.$1,3,5-$heptatriene is an acyclic (open-chain) polyene. Since it is not a cyclic system,it cannot exhibit the complete delocalization required for aromaticity.

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