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JEE Main levelSingle correct optionDifficulty 2 of 3o4122

The E1 solvolysis of a tertiary alkyl bromide is fastest in which of the following solvents?

  1. A50% water-50% ethanol by volume
  2. Babsolute ethanol
  3. Cdiethyl ether
  4. Dhexane

Answer: A

The rate-determining ionisation produces ions from a neutral molecule, and its transition state is stabilised by solvents of high polarity and hydrogen-bond donor ability. Of the choices, the water-rich mixture is most ionising; hexane and ether stabilise ions least.
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