Which of the following compounds are aromatic | vedclass

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(C) Aromatic compounds consist of a conjugated planar ring system accompanied by delocalized $\pi$-electron clouds. Compounds that follow $H$ückel's r

Vedclass · Accepted Answer

$(i)$,$(iv)$ and $(v)$

Vedclass · Answer

(C) Aromatic compounds consist of a conjugated planar ring system accompanied by delocalized $\pi$-electron clouds. Compounds that follow $H$ückel's rule,i.e.,$(4n+2) \pi$ electrons,are aromatic.$(i)$ Furan: Has $6 \pi$ electrons ($4$ from double bonds + $2$ from lone pair on $O$),follows $(4n+2) \pi$ rule $(n=1)$,hence aromatic.$(ii)$ Cyclobutadiene: Has $4 \pi$ electrons,follows $4n \pi$ rule,hence anti-aromatic.$(iii)$ Cyclopropenyl anion: Has $4 \pi$ electrons,follows $4n \pi$ rule,hence anti-aromatic.$(iv)$ Pyridine: Has $6 \pi$ electrons,follows $(4n+2) \pi$ rule $(n=1)$,hence aromatic.$(v)$ Tropylium cation: Has $6 \pi$ electrons,follows $(4n+2) \pi$ rule $(n=1)$,hence aromatic.Therefore,$(i)$,$(iv)$ and $(v)$ are aromatic.

Which of the following compounds are aromatic?

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