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Acetylene when treated with dilute HCl a...

Acetylene when treated with dilute `HCl` at `60^(@)C(333K)` in presence of `HgCl_(2)` produces-

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Under these conditions additio of `H_(2)O` does not occur across the double bond. Instead `CI^(-)` being a stronger nucleophile than `H_(2)O` , attacks the `pi`- complex formed between acetylene and `Hg^(2+)` ions This is followed by addition of a proton to yield vinyl chloride as shown below :
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