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(A) To be aromatic,a compound must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,cyclic,and fully conjugated.$(I)$ Cyclopentadiene: It is

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$1$

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(A) To be aromatic,a compound must follow $H$ückel's rule ($4n+2$ $\pi$ electrons),be planar,cyclic,and fully conjugated.$(I)$ Cyclopentadiene: It is non-aromatic because it has an $sp^3$ hybridized carbon atom.$(II)$ Cyclooctatetraene: It is non-aromatic (tub-shaped,non-planar) and has $8$ $\pi$ electrons (anti-aromatic if planar,but it is non-planar).$(III)$ Borazine $(B_3N_3H_6)$: It is isoelectronic with benzene,planar,cyclic,and has $6$ $\pi$ electrons. It is aromatic.$(IV)$ $1,4-$diboracyclohexa$-2,5-$diene: It has $4$ $\pi$ electrons and is not fully conjugated in a way that satisfies $H$ückel's rule for aromaticity.Thus,only structure $(III)$ is aromatic.The correct option is $A$.

Identify the number of aromatic compounds from the following structures:
$(I)$ Cyclopentadiene
$(II)$ Cyclooctatetraene
$(III)$ Borazine $(B_3N_3H_6)$
$(IV)$ $1,4-$diboracyclohexa$-2,5-$diene

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Identify the number of aromatic compounds from the following structures:$(I)$ Cyclopentadiene$(II)$ Cyclooctatetraene$(III)$ Borazine $(B_3N_3H_6)$$(IV)$ $1,4-$diboracyclohexa$-2,5-$diene