Chemistry - GOC Question with Solution | TestHub

The O lone pair can be pushed into the ring : the ${\mathrm{O}}^{+}$ forms with a carbanion on ${\mathrm{C}}_2$, ${\mathrm{C}}_3$, ${\mathrm{C}}_4$ or ${\mathrm{C}}_5$.

Original charge placement : 1 form(s). Charge or lone pair moved : 4 form(s). Total = 5.