Question

Which of the following chemical system is non aromatic?

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

The molecules which do not satisfy Huckel rule or $(4n+2)\pi$ -electron rule and conditions of aromaticity are said to be non-aromatic. The compound D has total $4\pi e^{-}$ so it does not follow $(4n+2)$ rule and coplanarity is lost in it so it is non-aromatic compound. All other compounds (A, B, C) are planar and have $6\pi e^{-}$ (option A and C) and $10\pi e^{-}$ (option D) , so they are aromatic.



$s{p}^3$