Which of the following sets contains only aro | vedclass

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(D) compound is aromatic if it follows $H$ückel's rule: it must be cyclic,planar,fully conjugated,and have $(4n+2) \pi$ electrons,where $n = 0, 1, 2,

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(D) compound is aromatic if it follows $H$ückel's rule: it must be cyclic,planar,fully conjugated,and have $(4n+2) \pi$ electrons,where $n = 0, 1, 2, ...$ Let's analyze the options: $A$: Cyclobutadiene ($4 \pi$ electrons,anti-aromatic),Benzene (aromatic),Cyclooctatetraene ($8 \pi$ electrons,non-aromatic). $B$: Cyclopentadienyl cation ($4 \pi$ electrons,anti-aromatic),Cyclopentadienyl anion ($6 \pi$ electrons,aromatic),Furan ($6 \pi$ electrons,aromatic). $C$: Cyclopentadiene (non-aromatic,$sp^3$ carbon),Benzene (aromatic),Pyridine (aromatic). $D$: Cyclopropenyl cation ($2 \pi$ electrons,$n=0$,aromatic),Benzene ($6 \pi$ electrons,$n=1$,aromatic),Pyrrole ($6 \pi$ electrons,$n=1$,aromatic). Thus,all compounds in set $D$ are aromatic.

Which of the following sets contains only aromatic compounds?

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