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Explain addition reaction of hydrogen in...

Explain addition reaction of hydrogen in alkynes.

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Alkynes react with `Cl_(2) or Br_(2)` in presence of inert solvent like `"CCl"_(4)` to form dihalides and tetrahalides.
`HC equiv underset("ethyne")(CH ) + Cl_(2) + Cl_(2) overset("CCl"_(4))(rarr) underset(1,2,- "dichloroethene")(ClCH = CHCl) + Cl_(2) rarr underset(1,1.2,2, - "Tetrachloro ethene")(Cl_(2) - CH- CHCl_(2))`
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