Polymerization
a) Acytylene dimerizes (two molecules come together as one molecule) in the presence of cuprous chloride and ammonium chloride to give vinyl acetylene which on reacting with HCl gives chloroprene.
The later polymerizes to give neoprene - a synthetic rubber.
b) Cyclic polymerization
This takes place when alkyne is passed through red hot iron tube at 400 degress celsius.
Occurs in two stages. Acetylene becomes mesitylene.
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