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Hydration of alkynes gives ketones.

1. H3C–C≡C–CH → H3C–C=CH2
2. OH
3. H3C–C≡CH → Tautomerism
4. H3C–C≡CH → H3C–C=CH2

Correct answer: H3C–C≡CH → Tautomerism

Solution

Hydration of alkynes typically leads to the formation of enols, which tautomerize to ketones. This is a characteristic reaction of alkynes.

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