The electronic absorption spectra of some arylidene oxalic and arylidene succinic hydrazides are studied in organic solvents of different polarities. The absorption bands are assigned to elec¬tronic transitions, vibrations and band shift with changed solvent and substituent and discussed. The main bands in the ir spectra due to the carbohydrazone part are assigned and discussed in relation to substituent effect. The signals in the ’Hnmr spectra of some compounds are considered and explained in relative to molecular structures.