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COMEDK2025ChemistryHaloalkanes and HaloarenesActual

Consider the following compounds , CH ₃ Cl ( A ), CH ₃ Br ( B ), CH ₂ Br ₂( C ), CHBr ₃( D ) The correct order of boiling points of the compounds is:

Options

  1. AC > D > B > A
  2. BD > B > A > C
  3. CD > C > B > A
  4. DA > B > C > D

Correct answer

C. D > C > B > A

Step-by-step solution

The boiling point of haloalkanes depends primarily on the molecular mass and the strength of intermolecular forces, specifically dipole-dipole interactions and London dispersion forces. As the molecular mass increases, the magnitude of van der Waals forces increases, leading to higher boiling points. Comparing the compounds: (A) CH ₃ Cl : Molecular mass 15 + 35.5 = 50.5 u (B) CH ₃ Br : Molecular mass 15 + 80 = 95 u (C) CH ₂ Br ₂ : Molecular mass 14 + 160 = 174 u (D) CHBr ₃ : Molecular mass 13 + 240 = 253 u Since th

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