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JEE Main levelSingle correct optionDifficulty 2 of 3ap060

Butan-2-ol is heated with conc. at 443 K. The major alkene formed is

  1. Abutane
  2. B2-methylpropene
  3. Cbut-2-ene
  4. Dbut-1-ene

Answer: C

Acid-catalysed dehydration of secondary alcohols follows Saytzeff's rule, giving the more substituted (more stable) alkene. Loss of H from gives the disubstituted but-2-ene, which is favoured over the monosubstituted but-1-ene.
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