R-O-H ZnCl R-O-ZnCI2 Lewis base Lewis acid H (electron-pair (electron-pair donor) acceptor) Br一Br:+FeBr3 Br一Br-FeBr3 Lewis base Lewis acid (electron-pair (electron-pair donor) acceptor) 3.2 THE USE OF CURVED ARROWS IN ILLUSTRATING REACTIONS the direction of electron flow in a reaction. Besides it is a usely ow The curved arrows is commonly used by organic chemists to sh Method for indicating which bonds form and which bonds breakR O H R O+ Lewis acid H (electron-pair acceptor) Lewis base (electron-pair donor) ZnCl 2 ZnCl 2 - + Br Br + FeBr 3 Br Br + FeBr 3 - Lewis base (electron-pair donor) Lewis acid (electron-pair acceptor) 3.2 THE USE OF CURVED ARROWS IN ILLUSTRATING REACTIONS The curved arrows is commonly used by organic chemists to show the direction of electron flow in a reaction. Besides it is a useful Method for indicating which bonds form and which bonds break