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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Acetaldehyde when treated with dilute NaOH gives

`CH_(3) CH_(2)`OH

`CH_(3)` COOH

`CH_(3) - underset(OH)underset(|)(CH_(2)) - CHO`

`CH_(3) - CH_(3)`

Acetaldehyde when treated with dilute NaOH gives.

`CH_(3) CH_(2) OH`

`CH_(3) COOH`

`CH_(3)-underset(OH)underset(|)(CH)-CH_(2)-CHO`

`CH_(3) - CH_(3)`

When acetylene is treated with very dil. HCl in the presence of HgCl_(2) , the product obtained is

methyl chloride

acetaldehyde

vinyl chloride

formaldehyde