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in the reaction of addition of hydrogen halides to alkynes $\ce{Hg^2+}$ can be used as a catalyst. But what is its role? How does it increase the rate of reaction.

I think that the vacant orbitals in Hg would help in the process of ionisation of hydrogen halides. Is this concept correct? please help

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The main use of $\ce{Hg}$$^{\text{2+}}$ is to polarize the electron cloud of the alkyne. Else the attacking specie wont be able to approach the bond

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    $\begingroup$ You know you can comment under questions? If you wanna say one sentence from the top of your head, comment is a way to go. $\endgroup$ – Mithoron Mar 19 '17 at 16:22
  • $\begingroup$ Im sorry, but i aint got a commentable amount of reputation, like you. Seemingly want to maximize earnings dude @Mithoron $\endgroup$ – Supernova Mar 19 '17 at 16:28
  • $\begingroup$ @QuarkyLittleThing you mean that cyclic intermediate that $\ce{Hg^2+}$ forms with triple bond $\endgroup$ – Ankit Agrawal Mar 19 '17 at 17:00
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    $\begingroup$ Then make better answers. Also it's not like rep is a big deal. $\endgroup$ – Mithoron Mar 19 '17 at 17:02

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