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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3o4126

3,3-Dimethylbutan-2-ol is heated with conc. . Which statements are correct?

  1. AA 1,2-methyl shift takes place in the carbocation intermediate.
  2. BThe major alkene is 2,3-dimethylbut-2-ene.
  3. C2,3-Dimethylbut-1-ene is also formed as a minor product.
  4. D3,3-Dimethylbut-1-ene is the major alkene.

Answer: A, B, C

The secondary cation undergoes a methyl shift to the tertiary cation . Loss of the tertiary H gives the tetrasubstituted 2,3-dimethylbut-2-ene (major), and loss of a methyl H gives 2,3-dimethylbut-1-ene (minor). The unrearranged alkene is not the major product.
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