Which of the following cannot exist at room t | vedclass

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Question

(A) The molecule in option $A$ is cyclobutadiene. It is a $4n \pi$ electron system ($n=1$,total $4 \pi$ electrons),which makes it anti-aromatic accord

Vedclass · Accepted Answer

Cyclobutadiene

Vedclass · Answer

(A) The molecule in option $A$ is cyclobutadiene. It is a $4n \pi$ electron system ($n=1$,total $4 \pi$ electrons),which makes it anti-aromatic according to $H$ückel's rule. Anti-aromatic compounds are highly unstable and reactive,and thus cannot exist as stable molecules at room temperature. The other options represent stable or relatively stable species.

Which of the following cannot exist at room temperature?

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