Consider the reaction, X→HgSO4,  60oCdil.H2SO4Ketone. The compound ‘X’ in this reaction can never be

Acidic hydration of alkyne involves addition of water by Markonikoff's rule. The enol formed tautomerises to a stable ketone.∵Ethyne contains only two carbon atoms, the -OH group will be attached to terminal carbon atom.the enol formed tautomerises to an aldehyde.CH≡CH→dil.H2SO4CH|H=COH|H⇌tautomerismKeto-enolCH3-CH=O (2)   .    .    .  CH3-CO-CH2-CH3  is  formed (3)   .    .    .  CH3-CO-CH3  is  formed (4)   .    .    .  C6H5-CO-CH3 is  formed