Reduction of the nitro Group NO2 NH2 Zn,Sn,or Fe_ aq.HCI Treatment with zinc,tin,or iron in dilute acid will reduce the nitro to an amino group. This is the best method for adding an amino group to the ring. Chapter 17 12 Chapter 17 12 Reduction of the Nitro Group NO2 Zn, Sn, or Fe aq. HCl NH2 ▪ Treatment with zinc, tin, or iron in dilute acid will reduce the nitro to an amino group. ▪ This is the best method for adding an amino group to the ring