The alkyne shown is hydrated with dilute H2SO4 and HgSO4. Which structure is the product?

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NEET levelSingle correct optionDifficulty 1 of 3hc249

The alkyne shown is hydrated with dilute $H X_{2} SO X_{4}$ and $HgSO X_{4}$ . Which structure is the product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: A

The compound shown is propyne. Markovnikov addition of water puts OH on the internal carbon, giving an enol that tautomerises to the ketone propanone. The aldehyde would result from anti-Markovnikov addition (hydroboration), and the alcohol and the acid are not formed.

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The alkyne shown is hydrated with dilute $H X_{2} SO X_{4}$ and $HgSO X_{4}$ . Which structure is the product?