4-Chloro-3-nitro-, 4-hydrazino-3-nitro-, o-and m-nitro-, p-bromo-, 2, 4-, 2, 5-, and 3, 4- dichloro-, also 2, 3, 4-2, 4, 5-, and 2, 4, 6-trichloro-benzenesulphonhydrazides have been prepared and converted into a number of derivatives (eg, hydrazones, azides) required as potential pest-control agents. The relative stability of the various sulphonyl hydrazides is briefly discussed.