Answer:
First of all, mercury ions form a
complex \[(I)\]with acetylene. Since, \[{{H}_{2}}O\] is more nucleophilic than \[SO_{4}^{2-}\]
ion it attacks the complex \[(I)\] to form first vinyl alcohol which then
tautomerises to given acetaldehyde
In case of dil. \[HCl\], since, \[C{{l}^{-}}\]
ion is more nucleophilic than \[{{H}_{2}}O,\] it reacts with complex \[(I)\] to
form vinyl chloride.
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