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NEET levelSingle correct optionDifficulty 1 of 3o4039

Warming 3-hydroxybutanal with dilute aqueous gives, by E1cB loss of water,

  1. Abut-3-enal
  2. Bbutanal
  3. Cbut-2-enal
  4. Dbutane-1,3-diol

Answer: C

The base removes the acidic alpha-hydrogen to give an enolate, which expels hydroxide from the beta-carbon. The product is the conjugated aldehyde , but-2-enal (crotonaldehyde).
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