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NEET levelSingle correct optionDifficulty 1 of 3co061

3-Hydroxybutanal is warmed with dilute acid. The product formed by loss of water is

  1. Abutanal
  2. Bbut-3-enal
  3. Cbutan-2-one
  4. Dbut-2-enal

Answer: D

The beta-hydroxy aldehyde dehydrates across the alpha and beta carbons. The new C=C is conjugated with C=O, giving , but-2-enal.
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