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Explain hydration of alkynes....

Explain hydration of alkynes.

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When water is added to alkynes in presence of 60% `H_(2) SO_(4)` and mercuric sulphate as catalyst at `60^(@)`C gives an aldehyde or ketone.
`underset("Ethyne ")(HC equiv CH ) + H_(2)O underset(60^(@)C//HgSO_(4))overset(dilcdot H_(2)SO_(4))(rarr) CH_(2) - underset(OH)underset(|)(CH) rarr underset("acetaldchyde (ethanel)")(CH_(3) - CHO)`
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