Among P,Q,R and S,the aromatic compound(s) is | vedclass

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(D) $1$. $P$: Cyclopropenyl chloride reacts with $AlCl_3$ to form the cyclopropenyl cation,which is aromatic ($2\pi$ electrons,planar,cyclic,conjugate

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$A, B, C, D$

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(D) $1$. $P$: Cyclopropenyl chloride reacts with $AlCl_3$ to form the cyclopropenyl cation,which is aromatic ($2\pi$ electrons,planar,cyclic,conjugated). $2$. $Q$: Cyclopentadiene reacts with $NaH$ to form the cyclopentadienyl anion,which is aromatic ($6\pi$ electrons,planar,cyclic,conjugated). $3$. $R$: The reaction of hexane$-2,5-$dione with $(NH_4)_2CO_3$ (Paal-Knorr synthesis) yields $2,5-$dimethylpyrrole,which is aromatic ($6\pi$ electrons,planar,cyclic,conjugated). $4$. $S$: Tropone reacts with $HCl$ to form the hydroxy-tropylium cation,which is aromatic ($6\pi$ electrons,planar,cyclic,conjugated). Thus,all $P$,$Q$,$R$,and $S$ are aromatic compounds.

Among $P$,$Q$,$R$ and $S$,the aromatic compound$(s)$ is/are:

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