Question

Which are antiaromatic? check all that apply. the cycloheptatrienyl cation the cycloheptatrienyl anion the cyclopropenyl cation

Answer 1

The cyclo-heptatrienyl anion will be considered as antiaromatic compound.

A cyclic compound with a greater energy electron system due to the existence of a 4n delocalized electron is what makes up an anti-aromatic chemical.

Due to its eight pi electrons, the cycloheptatrienyl anion (also known as the tropylium anion) should be antiaromatic; yet, the extra lone pair on one carbon could enable that carbon to become $sp^{3}$ hybridized, placing the extra electrons in an $sp^{3}$ orbital. It would become non-planar as well as non-aromatic as a result.

Therefore, the cyclo-heptatrienyl anion will be considered as antiaromatic compound.

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