Which of the following compounds is/are not a | vedclass

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(A) To determine aromaticity,we check for cyclic,planar,fully conjugated systems with $(4n+2) \pi$ electrons.$(a)$ Cyclopropenyl cation: $2 \pi$ elect

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$b$,$c$ and $d$

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(A) To determine aromaticity,we check for cyclic,planar,fully conjugated systems with $(4n+2) \pi$ electrons.$(a)$ Cyclopropenyl cation: $2 \pi$ electrons $(n=0)$,cyclic,planar,conjugated. It is aromatic.$(b)$ Cyclopentadienyl cation: $4 \pi$ electrons ($n=1$ for antiaromatic),cyclic,planar,conjugated. It is antiaromatic.$(c)$ Cycloheptatrienyl anion: $8 \pi$ electrons (wait,let's re-evaluate: $6 \pi$ electrons in the ring + $2$ from anion = $8 \pi$ electrons). Actually,the cycloheptatrienyl anion $(C_7H_7^-)$ has $8 \pi$ electrons,making it antiaromatic.$(d)$ Cycloheptatriene: It has an $sp^3$ hybridized carbon atom,so it is non-aromatic due to the lack of continuous cyclic conjugation.Therefore,$(b)$,$(c)$,and $(d)$ are not aromatic.

Which of the following compounds is/are not aromatic?

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