text: what is the von baeyer's test? what is the purpose of this test? if i have 4 test tubes with samples of hexane in testtube 1, ethyne in test tube 2, ethene in test tube 3 and toluene in test tube 4, and added dilute potassium permanganate solution to each of the test tubes, how will i rank them in terms of which solution decolorized the potassium permangante solution the fastest?will any precipitate form? if yes, in which test tube? von baeyer's test (baeyer's reagent) is used to test for presence of triple and double bonds. it will react by turning brown.  in order from most saturated to least saturated (most non-single bonds)  hexane ethene ethyne toluene  i'm not sure whether ethyne or toluene would count as less saturated; ethyne has 1 triple bond, but toluene has 3 double bonds so i'm guessing it is toluene.