The total number of aromatic species generate | vedclass

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(C) To determine the aromaticity, we use the Huckel rule: a cyclic, planar, fully conjugated system with $(4n+2)$ $\pi$-electrons is aromatic, where $

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$3$

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(C) To determine the aromaticity, we use the Huckel rule: a cyclic, planar, fully conjugated system with $(4n+2)$ $\pi$-electrons is aromatic, where $n$ is an integer $(0, 1, 2, \dots)$.$(i)$ Cyclopropenyl chloride reacts with $SbCl_5$ to form the cyclopropenyl cation, which has $2$ $\pi$-electrons $(n=0)$. This is aromatic.$(ii)$ Cyclopentadiene reacts with sodium metal to form the cyclopentadienyl anion, which has $6$ $\pi$-electrons $(n=1)$. This is aromatic.$(iii)$ $7$-Bromocyclohepta-$1,3,5$-triene reacts with water to form the tropylium cation, which has $6$ $\pi$-electrons $(n=1)$. This is aromatic.$(iv)$ Cyclopentadienylamine reacts with $HNO_2$ to form a $4$ $\pi$-electron system (cyclopentadienyl cation), which is anti-aromatic (not aromatic).Therefore, there are $3$ aromatic species generated.

The total number of aromatic species generated in the following reactions is:

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