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.
Key Topics to Revise
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
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)
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
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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