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Predict the correct intermediate and product in the following reaction: H3C−C≡CH (H2O, H2SO4, HgSO4) → Intermediate (A) → Product (B)

1. A: H3C−C=CH, B: H3C−C=CH2 OH SO4
2. A: H3C−C=CH, B: H3C−C=CH O
3. A: H3C−C=CH2, B: H3C−C=CH OH SO4
4. A: H3C−C=CH2, B: H3C−C−CH3 SO4

Correct answer: A: H3C−C=CH, B: H3C−C=CH O

Solution

The reaction involves the hydration of a terminal alkyne (H3C−C≡CH) in the presence of H2SO4 and HgSO4, leading to the formation of an enol intermediate (A), which tautomerizes to a ketone (B). The correct intermediate is H3C−C=CH (enol), and the product is H3C−C=O−CH3 (methyl ketone).

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