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Butan-2-ol is heated with conc. at 440 K. The major product is

  1. Abut-1-ene
  2. Bbutan-1-ol
  3. Cbutane
  4. Dbut-2-ene

Answer: D

Protonation, loss of water to give a secondary carbocation, and loss of a proton follow the Saytzeff rule. The more substituted alkene, but-2-ene, is the major product.
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