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JEE Main levelOne or more correct optionsDifficulty 2 of 3o4194

Which statements about acid-catalysed dehydration of alcohols are correct?

  1. A2-Methylpropan-2-ol dehydrates under milder conditions (for example 20% at about 358 K) than primary alcohols.
  2. BPrimary alcohols dehydrate more easily than tertiary alcohols.
  3. C2-Methylpropan-2-ol gives 2-methylpropene.
  4. DDehydration of a secondary alcohol with /pyridine proceeds through a free carbocation that rearranges.

Answer: A, C

Tertiary alcohols dehydrate easily, with dilute acid at low temperature; this makes statement 1 correct and statement 2 wrong. 2-Methylpropan-2-ol gives only 2-methylpropene. /pyridine causes an E2 anti elimination without carbocation, so statement 4 is wrong.
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