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Addition of water to alkynes occurs in acidic medium and the presence of \text {Hg}^{2+} ions as a catalyst. Which of the following products will be formed on addition of water to but-1-yne under these conditions.

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The answer is the option (ii) On addition of water to but-1-yne in the presence of \text {H}_{2}\text {SO}_{4} and \text {HgSO}_{4} , 2-butanone is obtained (by Markovnikoff’s rule).

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