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MHT CET202519 Apr 2025Morning ShiftChemistryHaloalkanes and HaloarenesActual

Which of the following alkenes is most easily formed by dehydrohalogenation of alkyl halides?

Options

  1. AR ₂ C = CH ₂
  2. BRCH = CHR
  3. CR ₂ C = CHR
  4. DR ₂ C = CR ₂

Correct answer

D. R ₂ C = CR ₂

Step-by-step solution

Dehydrohalogenation follows Zaitsev's rule, favoring formation of the most substituted and stable alkene. Alkene stability increases with substitution: R ₂ C = CR ₂ (tetrasubstituted) > R ₂ C = CHR (trisubstituted) > RCH = CHR (disubstituted) ≈ R ₂ C = CH ₂ (disubstituted). The tetrasubstituted alkene R ₂ C = CR ₂ possesses maximum hyperconjugative stabilization and will form most readily.

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