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Halogen Derivatives

Maharashtra Board · Class 12 · Chemistry

Quick revision notes for Halogen Derivatives — Maharashtra Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Classification and Nomenclature

  • Classification based on hydrocarbon skeleton: haloalkanes, haloalkenes, haloalkynes, haloarenes
  • Classification based on number of halogens: mono, di, tri, polyhalogen compounds
  • Monohalogen compounds classified by carbon hybridization and position
2

Preparation Methods

  • From alcohols: Most important method using HX, PX₃, or SOCl₂
  • From hydrocarbons: Addition of HX to alkenes (Markovnikov's rule)
  • Halogen exchange: Finkelstein reaction (R-Cl + NaI → R-I), Swartz reaction (R-Cl + AgF → R-F)
3

Physical Properties

  • C-X bonds are polar due to electronegativity difference
  • Boiling points: R-I > R-Br > R-Cl > R-F (due to van der Waals forces)
  • For same halogen: boiling point increases with chain length
4

Optical Isomerism and Chirality

  • Chiral carbon has four different groups attached
  • Chiral molecules are non-superimposable on mirror image
  • Enantiomers have equal and opposite optical rotation

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Full Notes

Key Concepts

Halogen derivatives are classified based onKey preparation methods includePhysical properties depend on CCompounds with chiral carbon atoms (carbonTwo mechanisms exist

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How to score full marks in Halogen Derivatives — Maharashtra Board Class 12 Chemistry?
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Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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