vegetable oil removes the colour from bromine water when the oil has been hardened it doesnt react in any way?

Question

Explain these observations??? PLEASE HELP I CANT DO THIS I AM SO STUCK!!!! Thank you xXx

Answer 1

Normal vegetable oil contains plenty of double bonds for the bromine to react with (and be decolorised). But when the oil is hardened, the double bonds are removed with hydrogen, so there is nothing now for the bromine to react with, and it stays orange.

Answer 2

Poly unsaturarated vegetable oils react with bromine in bromine water(like Iodine at double bonds)-and the oil was known as "brominated oil"-hence the discolouration. Brominated oil was used in certain kinds of very famous brands of Aerated soft Drinks to give the beverage a mild orange colour.Government of India banned this on the advice of experts-I do not know about other countries-and the addition of Brominated oil was quitely withdrawn.No body bothered about those who drank those beverages for ages.