Question

Which of the following annulenes are aromatic?

• A. $\left[8\right]$-Annulene
• B. $\left[10\right]$-Annulene
• C. $\left[12\right]$-Annulene
• D. $None$

Answer 1

Answer: (A)

$\left[8\right]$-Annulene

By using the Huckels rule it shows that benzene is aromatic compound because it having (4n+2) $\pi$ electron system but this (8) annulene obeys huckels rule having $4n\pi$ eletron system,so it is antiaromatic compound.