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Haloalkanes and Haloarenes

Chhattisgarh Board · Class 12 · Chemistry

Quick revision notes for Haloalkanes and Haloarenes — Chhattisgarh Board Class 12 Chemistry. Key concepts, formulas, and definitions for last-minute revision.

29 questions22 flashcards5 concepts

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A flowchart illustrating the general reaction of alcohols with halogen acids (HX) to form alkyl halides, showing the reactivity order of primary, secondary, and tertiary alcohols.
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Key Topics to Revise

1

Classification of Haloalkanes and Haloarenes

  • Based on number of halogen atoms: Mono, di-, tri-, tetra- halogen compounds
  • Alkyl halides (R-X): Halogen attached to sp³ hybridized carbon
  • Primary (1°), Secondary (2°), Tertiary (3°) alkyl halides based on carbon attachment
2

Nomenclature

  • Common names: Alkyl group + halide (e.g., methyl chloride)
  • IUPAC names: Halo-substituted hydrocarbons (e.g., chloromethane)
  • For benzene derivatives: Use ortho (o-), meta (m-), para (p-) or numbers 1,2; 1,3; 1,4
3

Nature of C-X Bond

  • C-X bond is polar due to electronegativity difference (C δ⁺ - X δ⁻)
  • Bond length increases: C-F < C-Cl < C-Br < C-I
  • Bond strength decreases: C-F > C-Cl > C-Br > C-I
4

Preparation of Haloalkanes

  • From alcohols: ROH + HX → RX + H₂O (with ZnCl₂ catalyst for 1° and 2° alcohols)
  • Using SOCl₂: ROH + SOCl₂ → RCl + SO₂ + HCl (preferred method - gaseous products escape)
  • Using phosphorus halides: 3ROH + PX₃ → 3RX + H₃PO₃

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Full Notes

Key Concepts

Haloalkanes contain halogen bonded to sp³SN2 mechanism involves simultaneous bond formationChiral molecules are nonβAryl halides are less reactive toward

Frequently Asked Questions

What are the important topics in Haloalkanes and Haloarenes for Chhattisgarh Board Class 12 Chemistry?
Haloalkanes and Haloarenes covers several key topics that are frequently asked in Chhattisgarh Board 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 Haloalkanes and Haloarenes — Chhattisgarh Board Class 12 Chemistry?
Understand the core concepts first, then work through the 29 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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