Write an equation for the reaction of CH4CH2C(O)CH3 with BF3, a Lewis acid, and show by the use of curved arrows how the reaction occurs. - Show all hydrogen atoms that are not attached to a carbon atom. - Apply formal charges where appropriate. - Assign lone pairs and radical electrons where appropriate. - Use the "starting points" menu to revert to the original molecule(s) shown. - Draw the appropriate electron-flow arrows. - Omit + signs between structures