Give the mechanism of the following reactions:
i) Addition of H2O to alkyne
ii) Addition of HBr to conjugated diene
i) Addition of H2O to alkyne:
The addition of water to an alkyne occurs via an acid-catalyzed hydration reaction, and it proceeds through a Markovnikov addition mechanism. The general mechanism is as follows:
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Protonation of the alkyne: The alkyne is protonated by a strong acid such as H2SO4 or H3PO4, to form a _________ ________ _______ __________ _________ ______ _____.
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