Among the following,the number of aromatic co | vedclass

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(A) To determine if a compound is aromatic,it must satisfy $H$ückel's rule: it must be planar,cyclic,fully conjugated,and contain $(4n + 2) \pi$ elect

Vedclass · Accepted Answer

$5$

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(A) To determine if a compound is aromatic,it must satisfy $H$ückel's rule: it must be planar,cyclic,fully conjugated,and contain $(4n + 2) \pi$ electrons,where $n = 0, 1, 2, ...$.Let us analyze the given structures:$1$. Cyclooctatetraene: Non-planar (tub-shaped),$8 \pi$ electrons. Not aromatic.$2$. Cyclopropenyl anion: $4 \pi$ electrons. Anti-aromatic.$3$. Cyclopropenyl cation: $2 \pi$ electrons $(n=0)$. Aromatic.$4$. Cyclohexadiene: Not fully conjugated. Not aromatic.$5$. Cycloheptatrienyl cation (tropylium ion): $6 \pi$ electrons $(n=1)$. Aromatic.$6$. Cyclopentadienyl cation: $4 \pi$ electrons. Anti-aromatic.$7$. Cyclopentadienyl anion: $6 \pi$ electrons $(n=1)$. Aromatic.$8$. $1,2$-dihydronaphthalene: Not fully conjugated. Not aromatic.$9$. Phenanthrene: $14 \pi$ electrons $(n=3)$. Aromatic.The aromatic compounds are: cyclopropenyl cation,cycloheptatrienyl cation,cyclopentadienyl anion,and phenanthrene.Total number of aromatic compounds = $4$.Since $4$ is not in the options,let us re-evaluate the structures provided in the image.Looking closely at the provided solution image,it identifies: cyclopropenyl cation,cycloheptatrienyl cation,cyclopentadienyl anion,and phenanthrene as aromatic. The total count is $4$. Given the options,there might be a discrepancy in the question's provided options or the image interpretation. Based on standard chemistry,the count is $4$.

Among the following,the number of aromatic compound$(s)$ is

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Identify the correct statements for a ring system to exhibit aromaticity.
$(i)$ It must not be planar.
$(ii)$ It must possess $(4n+2) \pi$-electrons.
$(iii)$ It must be planar.
$(iv)$ It must possess $4n \pi$-electrons.
The correct answer is

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