Alkenes react with halogens like bromine ( Br2cap B r sub 2 ) or chlorine ( Cl2cap C l sub 2
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While alkenes can burn, they often undergo incomplete combustion , resulting in a smoky flame due to unburnt carbon particles. Key Concepts for Exam Success Alkenes react with halogens like bromine ( Br2cap
in the presence of a catalyst (like nickel) converts an alkene into an alkane. Alkenes are the monomers used to create addition
Alkenes are the monomers used to create addition polymers like poly(ethene). This involves thousands of alkene molecules joining together as the double bonds open up.
). The reaction with bromine water is a standard test for unsaturation: the orange-brown liquid turns . Reaction with Hydrogen (Hydrogenation): Adding H2cap H sub 2
They are called "unsaturated" because they do not contain the maximum possible number of hydrogen atoms for the given number of carbons. Core Reactions Covered in Chemsheets 1232