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During the hydration of an alkyne using dilute and , the initial stable intermediate formed prior toReaction Mechanism Chemistry Question

Question

During the hydration of an alkyne using dilute $H_2SO_4$ and $HgSO_4$, the initial stable intermediate formed prior to tautomerization is:

Answer: A

💡 Solution & Explanation

$Hg^{2+}$ catalyzes the nucleophilic addition of water, initially forming an unstable enol ($C=C-OH$) which rapidly undergoes tautomerization to the stable keto form.

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