Chemistry - GOC Question with Solution | TestHub

Pattern : a lone pair on O next to a $\mathrm{C}=\mathrm{C}$. The O lone pair forms $\mathrm{C}={\mathrm{O}}^{+}$ and the $\mathrm{C}=\mathrm{C}$ pi pair moves onto the terminal $\mathrm{C}{\mathrm{H}}_2$ as a carbanion.