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Certainly, chemical reactions can propagate far faster than the speed of sound. If the reaction emits electromagnetic radiation, e.g. light, and is itself initiated by light, then the speed of propagation is the speed of light in that medium. See this article from Sandia National Labs, or from the Royal Society.


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As suggested, vinyl carbocations are "much less stable" than alkyl cation and are probably NEVER intermediates in protic additions to simple (unconjugated) alkynes. Strong acids form pi complexes with alkynes and these are attacked by the resident nucleophile to produce an anti addition product. The chemical reduction of alkynes involve a sequence of ...


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