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MHT CET Medical202621 April 2026Evening ShiftChemistryHaloalkanes and HaloarenesActual

What is the correct order of reactivity of haloalkanes towards -elimination reaction?

Options

  1. A1^ > 2^ > 3^
  2. B3^ > 2^ > 1^
  3. C1^ > 3^ > 2^
  4. D3^ > 1^ > 2^

Correct answer

B. 3^ > 2^ > 1^

Step-by-step solution

The reactivity of haloalkanes towards -elimination reactions depends on the stability of the alkene formed as the product. According to Saytzeff's rule, highly substituted alkenes are more stable due to a greater number of hyperconjugative structures. Tertiary ( 3^ ) haloalkanes yield more substituted alkenes compared to secondary ( 2^ ) and primary ( 1^ ) haloalkanes. Furthermore, the transition state in the elimination reaction is stabilized by the electron-donating inductive effect and hyperconjugation of the at

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