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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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rkay9241 rkay9241
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12 years ago
I'm stuck on a question for chemistry and can't find the answer in my notes. Help please? x
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#1
12 years ago
Actually you don't need the alkane.  The Bromine (Br2 in H+, since H20 is considered both acid and base), reacts with any double bond to create a vicinal dihalide (anti addition, trans product).
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#2
12 years ago
alkenes are unsaturated

when you add an alkene to bromine water (which has a yellow colour), the alkene reacts with the bromine - breaking its double carbon bond. you end up with single carbon bonds with bromine taking the place of where the hydrogen usually is. Since bromine is being used up the yellow colour of the solution fades

Short answer
add substance to bromine water. If solution goes colourless, the substance is an alkene (or alkyne)
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