(1) Dimethyl acetylene with 40% H2SO4 in the presence of mercuric sulphate (HgSO4) forms ethyl methyl ketone by tautomerisation.
![](https://www.sarthaks.com/?qa=blob&qa_blobid=13144262277387091850)
(2) Ethyl acetylene with 40% H2SO4 in the presence of mercuric sulphate (HgSO4) forms Butan-2-one by tautomerisation.
![](https://www.sarthaks.com/?qa=blob&qa_blobid=17520729463553953753)
(3) Diethyl acetylene with 40% H2SO4 in the presence of mercuric sulphate (HgSO4) forms hexan-3-one.
![](https://www.sarthaks.com/?qa=blob&qa_blobid=12276481559940952140)