Chemistry - GOC Question with Solution | TestHub

Loss of $\mathrm{C}{\mathrm{l}}^{-}$ leaves a cyclopropenyl cation with 2 π electrons (4n+2, n = 0), which is aromatic and further stabilised by the three methyl groups. Loss of $\mathrm{C}{\mathrm{l}}^{+}$ would leave a cyclopropenyl anion with 4 π electrons, which is anti-aromatic.