Identify the number of aromatic compounds fro | vedclass

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(A) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(i)$ $1,2,4$-triaz

Vedclass · Accepted Answer

$4$

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(A) To determine aromaticity,a compound must be cyclic,planar,fully conjugated,and follow $H$ückel's rule ($4n+2$ $\pi$ electrons).$(i)$ $1,2,4$-triazole: Planar,cyclic,$6$ $\pi$ electrons ($4$ from double bonds,$2$ from lone pair on $N$ at position $1$). Aromatic.(ii) $2$-pyrone: The oxygen atom is $sp^3$ hybridized at the carbonyl position,breaking conjugation. Non-aromatic.(iii) Benzimidazole: Planar,cyclic,$10$ $\pi$ electrons. Aromatic.(iv) Pyrazole: Planar,cyclic,$6$ $\pi$ electrons. Aromatic.$(v)$ Cyclooctatetraene dianion: Planar,cyclic,$10$ $\pi$ electrons. Aromatic.(vi) Pyrrolidinium cation: The nitrogen is $sp^3$ hybridized,breaking conjugation. Non-aromatic.(vii) Cyclopentadienyl cation: Planar,cyclic,$4$ $\pi$ electrons ($4n$ rule). Anti-aromatic.Thus,the aromatic compounds are $(i)$,(iii),(iv),and $(v)$. The total number is $4$.

Identify the number of aromatic compounds from the following structures:
$(i)$ $1,2,4$-triazole
(ii) $2$-pyrone
(iii) Benzimidazole
(iv) Pyrazole
$(v)$ Cyclooctatetraene dianion
(vi) Pyrrolidinium cation
(vii) Cyclopentadienyl cation

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Identify the number of aromatic compounds from the following structures:$(i)$ $1,2,4$-triazole(ii) $2$-pyrone(iii) Benzimidazole(iv) Pyrazole$(v)$ Cyclooctatetraene dianion(vi) Pyrrolidinium cation(vii) Cyclopentadienyl cation