various mixtures thereof a peroxy acid is an acid in which an acidic u2014 oh group has been replaced by an u2014 ooh group they are formed chiefly by elements in groups 14 15 and 16 of the periodic table but boron and certain transition elements are also known to form peroxy acids sulfur and phosphorus form the largest range of peroxy acids including some condensed forms such as peroxydiphosphoric acid h 4 p 2 o 8 and peroxydisulfuric acid h 2 s 2 o 8 this term also includes compounds such as peroxy carboxylic acids and meta chloroperoxybenzoic acid mcpba organic peroxides are organic compounds containing the peroxide functional group roor u2032 if the r u2032 is hydrogen the compound is called an organic hydroperoxide peresters have general structure rc o oor the o u2014 o bond easily breaks and forms free radicals of the form ro u2014 this makes organic peroxides useful for cleaning purposes there are four possible descriptions of the oxidizing agent product composition based on concentration u201c ultra concentrated u201d means that 80 to 100 of the bleach is active u201c concentrated u201d means that 40 to 79 of the bleach is active u201c bleach with additive u201d means that 20 40.