Chemistry - GOC Question with Solution | TestHub

Removing a proton (not $\mathrm{C}{\mathrm{l}}^{-}$) from the CH(Cl) carbon gives the cyclononatetraenide anion with 10 π electrons (4n+2, n = 2) : aromatic. Removing $\mathrm{C}{\mathrm{l}}^{-}$ instead would give the 8π cation, which is anti-aromatic.