Melting and boiling points of alkenes is almost the same as the corresponding alkane. At room temperature, low tribes gaseous, these tribes were liquid, and tribes - tribes are solid high.
2) Reactions of Alkenes
Alkene is much more reactive than alkanes because of the double bond. Alkene reactions mainly occur at the double bond.
The reactions of alkenes as follows.
a) Addition reactions (addition or saturation)
Addition reaction, the conversion of a double bond into a single bond with another atom binding way.
Substances that can mengadisi alkenes is:
(1) The hydrogen gas (H2)
CH2 = CH2 + H2
ethane
CH3-CH3
ethene
(2) Halogen (F2, Cl2, Br2, and I2)
CH2 = CH - CH3 + Br2
propene
(3) acid halides (HCl, HBr, HF, and HI)
If the alkene acid halide capture Markovnikov rules apply, ie H atom of acid halide is tied to the C atom bonded duplex that has more H atoms.
example:
propene
2-kloropropena
b) The reaction of combustion (oxidation with oxygen)
Alkene combustion produces CO2 and H2O.
C2H4 + 3 O2 2 CO2 + 2 H2O
Incomplete combustion of alkenes produce CO and H2O.
C2H4 + 2 O2 2 CO + 2 H2O
c) Polymerization Reaction
Polymerization reaction is a reaction in molecules of simple molecules (monomers) into large molecules (polymers).
example:
Polymerization of ethene to polythene
n CH2 = CH2 -> - CH2 - CH2--> [- CH 2 - CH 2 -] n
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