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Q.Fill in the blank: ________ is obtained on addition of water to ethyne in presence of H2SO4 and HgSO4.

Rajasthan RbseRajasthan Board Senior Secondary Examination 2025Subjective· 1mImportance★★★★★est
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Ethyne (acetylene) adds water in the presence of dilute H2SO4/HgSO4 catalyst (Markovnikov addition) to give the unstable enol vinyl alcohol, which tautomerises to acetaldehyde.

HC≡CH + H2O --(H2SO4, HgSO4 catalyst)--> [CH2=CH-OH] (vinyl alcohol, unstable enol) …

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