Triazole refers to a compound composed of three nitrogen, and tetrazole refers to a compound composed of four nitrogen. Triazole, tetrazole and imidazole are all a big category, and imidazole has no (biological) activity. Are you talking about their alkaline size? Imidazole is alkaline because of the lone pair on n, and its structure is * * * yoke! His derivatives should be classified and discussed: if imidazole is connected with benzene ring (or electron-withdrawing group) and lone yoke on N, its alkalinity will be weakened; When there is an electron-donating group, the basicity is enhanced, because the electronegativity of lone pair is enhanced. Imidazole has certain antibacterial ability, which is also related to its alkalinity.