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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ap035

Which statements about the dehydration of alcohols with conc. are correct?

  1. ATertiary alcohols dehydrate under milder conditions than primary alcohols.
  2. BEthanol with excess ethanol present at 413 K gives diethyl ether.
  3. CButan-2-ol gives but-1-ene as the major alkene, contrary to the Saytzeff rule.
  4. DPropan-2-ol at 413 K with excess alcohol gives diisopropyl ether in good yield.

Answer: A, B

Ease of dehydration is tertiary > secondary > primary (carbocation stability), so statement 1 is right. Statement 2 is the standard preparation of diethyl ether from a primary alcohol. Butan-2-ol follows Saytzeff and gives mainly but-2-ene. Secondary and tertiary alcohols give alkenes rather than ethers under these conditions.
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