If reductive ozonolysis takes place in the presence of Zn, it gives dicarbonyl Compound while oxidative ozonolysis produces two moles of acids.
(x) Reaction with AsCl3
It is an antidote for Lewisite and forms a non toxic compound after reaction with Lewisite.
(xi) Carbonylation
When acetylene reacts with CO + H2O or CO + ROH in the presence of nickel catalyst to form  or Esters. In both route carbonyl group is formed so known as carbonylation if any reagent undergo further addition, addition takes place according to marknowniffs rule.
(xii) Alcoholation of alkynes
When alkynes react with alcohol in the presence of BF3 and HgO, they form ethers. Lewis acids BF3 and HgO cause to absorb electronic cloud and increase reaction rate.
(xiii) Polymerisation of alkynes
Trimerisation of ethyne forms benzene while propyne forms 1,3,5- Trimetyl benzene.
Poly Isoprene exists in two forms
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