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The number of pi-bonds in the product fo...

The number of `pi`-bonds in the product formed by passing acetylene through dilute sulphuric acid containing mercuric sulphate is .......

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`underset(2pi" bond")(H-C-=C-H+H_(2)O)underset(H_(2)SO_(4))overset(Hg^(2+))tounderset(1pi-"bond")(H_(2)C=CH-OH)overset("Rearrangement")tounderset("Ethanal")(CH_(3)CHO`
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