Among the following,the antiaromatic compound | vedclass

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(B) The criteria for a compound to be anti-aromatic are that it must be cyclic,planar,fully conjugated,and possess $4n$ $\pi$-electrons (where $n = 1,

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$III$ and $V$

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(B) The criteria for a compound to be anti-aromatic are that it must be cyclic,planar,fully conjugated,and possess $4n$ $\pi$-electrons (where $n = 1, 2, 3, ...$).$(I)$ Azulene: It has $10$ $\pi$-electrons,which follows the $(4n+2)$ rule $(n=2)$. Thus,it is aromatic.$(II)$ Cycloheptatriene: It contains an $sp^{3}$ hybridized carbon atom,which breaks the continuous conjugation. Thus,it is non-aromatic.$(III)$ Cyclopentadienone: It has $4$ $\pi$-electrons in the ring (the lone pair on oxygen is not part of the cyclic conjugation in the same way as a carbanion,and the carbonyl carbon is $sp^{2}$ hybridized). It is anti-aromatic.$(IV)$ Indole: It has $10$ $\pi$-electrons ($8$ from carbons + $2$ from the nitrogen lone pair),following the $(4n+2)$ rule. Thus,it is aromatic.$(V)$ Cyclopropenyl anion: It has $4$ $\pi$-electrons ($2$ from the double bond + $2$ from the negative charge) and is fully conjugated with all atoms $sp^{2}$ hybridized. Thus,it is anti-aromatic.Therefore,compounds $III$ and $V$ are anti-aromatic.

Among the following,the antiaromatic compounds are:

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