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Ethanal is treated with cold dilute aqueous NaOH. The aldol addition product formed is

  1. A2-hydroxybutanal
  2. B3-hydroxybutanal
  3. Cbut-2-enal
  4. Dbutane-1,3-diol

Answer: B

The enolate attacks the carbonyl carbon of a second ethanal. This gives , 3-hydroxybutanal. Without heating, no dehydration occurs.
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