Construct the Frost circles for the cyclopentadienyl anion and cyclopentadienyl cation. What is their difference? 

• A. The Frost circles show that the cyclopentadienyl cation is antiaromatic, while the cyclopentadienyl anion is aromatic.
• B. The Frost circles show that the cyclopentadienyl cation is antiaromatic, while the cyclopentadienyl anion is aromatic.
• C. The Frost circles show that the cyclopentadienyl cation is aromatic, while the cyclopentadienyl anion is antiaromatic.
• D. The Frost circles show that the cyclopentadienyl cation is aromatic, while the cyclopentadienyl anion is antiaromatic.

Answer: (A)