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JEE Main levelSingle correct optionDifficulty 2 of 3co021

Hydration of which alkyne with dilute and gives an aldehyde?

  1. Apropyne
  2. Bbut-2-yne
  3. Cbut-1-yne
  4. Dethyne

Answer: D

Markovnikov hydration puts the OH on the more substituted sp carbon. Only ethyne has no substituent, so its enol tautomerises to . All the others give ketones.
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