मराठी

Physical Properties of Halogen Derivatives

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Physical Properties of Halogen Derivatives

  • Alkyl halides are colourless when pure but develop colour on exposure to light; they have a sweet smell
  • Polarity: Moderately polar
  • Solubility: Insoluble in water, soluble in organic solvents

Bond Length

  • Increases in order: R–F < R–Cl < R–Br < R–I

Bond Strength

  • Decreases in order: R–F > R–Cl > R–Br > R–I

Boiling Point

  • Order: R–I > R–Br > R–Cl > R–F
  • Increases with an increase in molecular mass
  • Decreases with branching

Dipole Moment

  • Decreases as the electronegativity of halogen decreases

Isomeric Dihalobenzenes

  • Boiling point: nearly the same
  • Melting point: para > ortho/meta
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