[kingever66]

Doing an experiment about hydrocarbons. Would like to know about the differences between Aromatic and Aliphatic..

Aliphatic saturated, when dropped with Nitration reagent, turned into colorless while the unsaturated ignited then turned into brown solid. When dropped with Bromine reagent, the Aliph saturated turned dark orange and the unsaturated turned colorless

What could this mean? and does it have anything to do with their bonds?

[macman104]

I'm not sure about the nitration reagent, but for the bromine...bromine is typically a dark orange to begin with.  When added to a saturated aliphatic hydrocarbon, no reaction takes place and you see the dark orange color of the bromine.  When the bromine is added to an unsaturated hydrocarbon, the two react and you lose your orange bromine color.  This reaction between multiply bonded hydrocarbons and bromine is a pretty standard qualitative test for multiply bonded compounds.  Here's a link that talks about the addition of bromine to double bonds.

[agrobert]

You can not nitrate an aliphatic compound with simple nitration.  The nitro group is very flourescent when on an aromatic compound therefore these nitrated products are commonly yellow, red or orange.