The product hydration of 1-butyne in the presence of HgSO4/H2SO4 is?

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Multiple Choice

The product hydration of 1-butyne in the presence of HgSO4/H2SO4 is?

Hydration of a terminal alkyne with Hg2+/H2SO4 proceeds by Markovnikov addition of water, followed by enol–keto tautomerization. The water adds so that the carbonyl ends up on the more substituted carbon, giving a ketone of the form R-CO-CH3, where R is the group attached to the alkyne. For 1-butyne, the alkyne is CH3-CH2-C≡CH, so R is ethyl (CH3-CH2-). The product becomes CH3-CH2-CO-CH3, which is 2-butanone. This is a ketone, not an aldehyde, alcohol, or diol, which is why the other options don’t fit the reaction outcome.

Hydration of a terminal alkyne with Hg2+/H2SO4 proceeds by Markovnikov addition of water, followed by enol–keto tautomerization. The water adds so that the carbonyl ends up on the more substituted carbon, giving a ketone of the form R-CO-CH3, where R is the group attached to the alkyne.

For 1-butyne, the alkyne is CH3-CH2-C≡CH, so R is ethyl (CH3-CH2-). The product becomes CH3-CH2-CO-CH3, which is 2-butanone. This is a ketone, not an aldehyde, alcohol, or diol, which is why the other options don’t fit the reaction outcome.

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