Which compound is antiaromatic because it is planar, fully conjugated, and contains 4n pi electrons (n = 1)?
Answer and explanation
Correct answer: A. Cyclobutadiene
Cyclobutadiene is planar with a continuous cyclic conjugated ring containing 4 pi electrons (4n with n=1). According to Huckel's rule, this makes it antiaromatic, conferring extreme instability and rapid dimerization at room temperature.
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