Chemistry - GOC Question with Solution | TestHub

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

$\mathrm{s}{\mathrm{p}}^3$