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Explain Linear polymerisation of alkynes...

Explain Linear polymerisation of alkynes.

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When alkyne is passed into `Cu_(2)Cl_(2)` solution containing ammonium chloride dimerisation takes place giving vinyl acetylenes.
`underset("acetylene")(2HC equiv CH) underset(NH_(4)Cl)overset(Cu_(2)Cl_(2))(rarr) CH_(2) = underset("Vinyl accetlylene")(CH ) - C equiv CH`
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