Monochloramine reacts with hydrated electrons very rapidly, k(NH2Cl+e(aq)(-)) = (2.2 +/- 0.3) x 10(10) L mol(-1) s(-1), to produce (NH2)-N-. radicals. It reacts with (OH)-O-. radicals more slowly, k(NH2Cl+(OH)-O-.) = (5.2 +/- 0.6) x 10(8) L mol(-1) s(-1), to produce (NHCl)-N-. radicals. While (NH2)-N-. exhibits an absorption peak at 530 nm, with a molar absorption coefficient epsilon(530) = 80 L mol(-1) cm(-1), (NHCl)-N-. exhibits two peaks at 330 and 580 nm, epsilon(330) = (85 +/- 30) L mol(-1) cm(-1) and epsilon(580) = (56 +/- 30) L mol(-1) cm(-1). The (NHCl)-N-. radical undergoes self-decay and can react also with O-2 to form a peroxyl radical. It is suggested that the peroxyl radical exists in equilibrium NHClO2. reversible arrow (NHCl)-N-. + O-2 with an estimated equilibrium constant of (3 +/- 2) x 10(-1) mol L-1. The reaction of chloramine with the carbonate radical is suggested to form a complex [CO3NH2Cl](.-) with k(f) = 2.5 x 10(5) L mol(-1) s(-1) and k(r) = 4 x 10(2) s(-1), and this complex decomposes with k = 7 x 10(2) s(-1) to form (NHCl)-N-..