O fea o vaega tāua o vailaau o loo i le tusiga, o loo iai se numera i lona faaupuga? I le taliina o le fesili na muamua atu, ia tusi se tala o loo iai le tali. E mafai ona faia i le 1 i le 20 fuaiupu. Faamatalaga:
O isi o vaega e sili ona tāua o vailaau o loo iai le okesene, e aofia ai (o le "R" o se vaega o le okesene): o le alcohols (R-OH); ethers (R-O-R); ketones (R-CO-R); aldehydes (R-CO-H); carboxylic acids (R-COOH); esters (R-COO-R); acid anhydrides (R-CO-O-CO-R); ma amides (R-C(O) -NR2). E tele ni solvents taua e aofia ai le okesene, e aofia ai: acetone, methanol, ethanol, isopropanol, furan, THF, diethyl ether, dioxane, ethyl acetate, DMF, DMSO, acetic acid, ma le formic acid. Acetone ((CH3) 2CO) ma phenol (C6H5OH) o loʻo faʻaaogaina e avea ma mea fafaga i le tuʻufaʻatasia o le tele o vailaʻau eseese. O isi mea taua o le okesene o le: glycerol, formaldehyde, glutaraldehyde, citric acid, acetic anhydride, ma le acetamide. O epoxides o ether ia o loo iai le okesene o se vaega o se mama e tolu atoms.