Question

222 Exploring Chemistry 2b. Reaction? Addition of KMnO observations Compounds Dark bw salid quid vporde Bark vislat Tuned dark vilet Hexane Cyclohexene Toluene Unknown Write out the chemical equation for each reaction and name the reactants and products. If the test was pos itive, show the product that forrmed. If the test was negative, write NR, indicating no reaction took place was a saturated, unsaturated compound. (circle one) Unknown 3. Solubility with acetone? Reaction with KMnO4 observations Reaction Substance Mineral spirits No rahion Motor oil No reachor Vaseline The "household products" appear to be (check one). saturated, unsaturated compounds

Answer 1

2b) The KMnO₄ test is positive when the violet color of permanganate dissappears, which is a consequence of its reaction with non-aromatic double bonds in organic molecules. If there are no double bonds or if they are part of an aromatic ring (such as the case of toluene), the reaction does not happen and the color doesn't disappear. For cyclohexene, you should have observed the violet color fading due to the reaction:

OH KMnO Mn2 Violet OH Non-colored

If you saw a dark brown solid, it's probably because there was some kind of contamination in the cyclohexene or in the test tube, since this color is characteristic of MnO₂, which is produced in presence of other organic matter.

Unkown was a saturated compound, since the violet color did not dissapear.

3) For household products you got a positive reaction with mineral spirits (thus, it is insaturated) and negative results with motor oil and vaseline (which means they are saturated).