Question

Cyclobutadiene is aromatic
(A) True
(B) False

Answer 1

Hint :The organic compound cyclobutadiene has the formula C₄H₄. Because of its proclivity to dimerize, it is extremely reactive. Despite the fact that the parent compound has yet to be isolated, certain substituted derivatives are stable, and a single molecule of cyclobutadiene is very stable.

Complete Step By Step Answer:
The organic compound cyclobutadiene has the formula C₄H₄. Because of its proclivity to dimerize, it is extremely reactive. Despite the fact that the parent compound has yet to be isolated, certain substituted derivatives are stable, and a single molecule of cyclobutadiene is very stable.
Aromaticity is a property of cyclic (ring-shaped), planar (flat) structures with pi bonds in resonance (those containing delocalized electrons) that provides greater stability than other geometric or connective arrangements with the same collection of atoms in chemistry.
Antiaromaticity describes a cyclic molecule with a pi electron framework that has a higher energy due to the presence of 4n delocalized (pi or lone pair) electrons. Antiaromatic compounds, in contrast to aromatic compounds, which obey Hückel's law ([4n+2] pi electrons) and are highly stable, are highly unstable and reactive. Molecules can change shape to avoid antiaromatic instability, becoming non-planar and thus breaking some of the pi interactions. Antiaromatic compounds have a paramagnetic ring current, which can be detected using NMR spectroscopy, in comparison to aromatic compounds, which have a diamagnetic ring current.
The antiaromatic compound cyclobutadiene is a textbook example. In a conjugated system, it is conventionally understood to be planar, cyclic, and to have four pi electrons (4n for n=1).
Hence, Option B is Correct.

Note :
Antiaromaticity describes a cyclic molecule with a pi electron framework that has a higher energy due to the presence of 4n delocalized (pi or lone pair) electrons. Antiaromatic compounds, in contrast to aromatic compounds, which obey Hückel's law ([4n+2] pi electrons) and are highly stable, are highly unstable and reactive.