Which of the following is anti-aromatic?

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(A) compound is anti-aromatic if it follows these criteria:$1$. It is cyclic and planar.$2$. It is fully conjugated.$3$. It contains $4n$ $\pi$-electr

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Cyclobutadiene

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(A) compound is anti-aromatic if it follows these criteria:$1$. It is cyclic and planar.$2$. It is fully conjugated.$3$. It contains $4n$ $\pi$-electrons (where $n = 1, 2, 3, ...$).- Cyclobutadiene $(C_4H_4)$ is cyclic,planar,fully conjugated,and has $4$ $\pi$-electrons ($4n$ where $n=1$). Thus,it is anti-aromatic.- Benzene is aromatic ($6$ $\pi$-electrons).- Cyclopentadienyl anion is aromatic ($6$ $\pi$-electrons).- Cycloheptatrienyl cation is aromatic ($6$ $\pi$-electrons).

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