Which of the following chemical systems is no | vedclass

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(D) Molecules that do not satisfy the Huckel rule or $(4n+2) \pi$-electron rule are classified as non-aromatic or anti-aromatic depending on their cyc

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Cyclopentadiene

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(D) Molecules that do not satisfy the Huckel rule or $(4n+2) \pi$-electron rule are classified as non-aromatic or anti-aromatic depending on their cyclic conjugation.$1$. Benzene,Naphthalene,and Thiophene are aromatic because they are cyclic,planar,fully conjugated,and follow the $(4n+2) \pi$-electron rule.$2$. Cyclopentadiene (option $d$) has an $sp^3$ hybridized carbon atom in the ring,which breaks the continuous conjugation. Therefore,it is non-aromatic.

Which of the following chemical systems is non-aromatic?

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