I was very surprised by the results of my inquiry into this. Apparently
benzaldoxime (C6H5)CH=O is oxidized by bleach (NaOCl) to form
benzaldoxime peroxide (C6H5)CH=NOON=CH(C6H5), which has a melting point of
105degC with decomposition. Oxidation of phenyl-nitromethane by nitrous acid apparently yields a combination of benzaldoxime peroxide and benzonitrolic acid,
(C6H5)C(NO2)=NOH.