Question

The cyclopentadienyl cation is antiaromatic while cyclopentadienyl anion is aromatic.
If true enter 1, else enter 0.

• A. 1

Answer 1

The correct option is A 1
The cyclopentadienyl anion is aromatic as it contains 6 $pi$ electrons which satisfy Huckel's rule $(4n+2)\pi$ electrons.
The cyclopentadienyl cation is antiaromatic as it contains 4 $pi$ electrons ($4n\pi$ electrons).