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Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes)

Telangana Open School (TOSS) · Class 12 · Chemistry

Quick revision notes for Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes) — Telangana Open School (TOSS) Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

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Key Topics to Revise

1

Nomenclature of Haloalkanes and Haloarenes

  • Haloalkanes are halogen derivatives of aliphatic hydrocarbons; haloarenes are derivatives of aromatic hydrocarbons where halogen is directly attached to the benzene ring.
  • IUPAC naming: Select the longest carbon chain containing the halogen. Number it to give the halogen the lowest possible number.
  • Prefixes like chloro-, bromo-, iodo- are used before the parent hydrocarbon name.
2

Preparation Methods

  • Haloalkanes can be prepared from alkanes (free radical halogenation), alcohols (using HX, PX₃, PX₅, SOCl₂), and other methods.
  • Haloarenes are prepared by direct halogenation of aromatic compounds using Lewis acids like FeCl₃ or FeBr₃.
  • Sandmeyer and Gattermann reactions are used to prepare chloro- or bromoarenes from diazonium salts.
3

Physical and Chemical Properties

  • Haloalkanes are polar but immiscible in water due to inability to form H-bonds.
  • Boiling points: RI > RBr > RCl > RF due to increasing molecular mass and van der Waals forces.
  • Melting points of p-dihalobenzenes are higher than ortho and meta due to symmetrical packing.
4

Important Polyhalogen Compounds

  • Chloroform (CHCl₃): IUPAC name trichloromethane; used as solvent and in carbylamine test.
  • Stored in dark bottles with ethanol to prevent oxidation to phosgene (COCl₂).
  • Iodoform (CHI₃): yellow solid, antiseptic; formed via iodoform test for methyl ketones or secondary alcohols with CH₃CH(OH)– group.

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Full Notes

Key Concepts

Haloalkanes are named by selectingHaloalkanes can be prepared from alkanesHaloalkanes and haloarenes are polar butHaloalkanes are more reactive than haloarenesImportant polyhalogen compounds include chloroform (CHCl₃)

Frequently Asked Questions

What are the important topics in Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes) for Telangana Open School (TOSS) Class 12 Chemistry?
Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes) covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Compounds of Carbon Containing Halogens (Haloalkanes and Haloarenes) — Telangana Open School (TOSS) Class 12 Chemistry?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

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

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