हिंदी

Methods of Preparation of Alkyl Halides

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Estimated time: 1 minutes

Key_points

  1. From alkanes
    Free radical halogenation:
    \[CH_{3}CH_{2}CH_{2}CH_{3}\xrightarrow{Cl_{2}UV-light}CH_{3}CH_{2}CH_{2}CH_{2}Cl+CH_{3}CH_{2}CH(Cl)CH_{3}\]
  2. From alkenes
    Addition of hydrogen halide:
    C=C + HX → R–X
  3. From alcohols
    \[3ROH+PCl_{3}\longrightarrow3R-Cl+H_{3}PO_{3}\]
    \[ROH+PCl_{5}\longrightarrow R\longrightarrow Cl+POCl_{3}+HCl\]
    \[ROH+HCl\xrightarrow{ZnCl_{2}}R-Cl+H_{2}O\]
    \(ROH\xrightarrow{RedP/Cl_{2}}R-Cl\)
    \[R—OH+SOCl_2\xrightarrow{\Delta}R—Cl+SO_2\uparrow+HCl\]
  4. Halogen exchange reactions
    Finkelstein reaction:
    R–Cl / R–Br + NaI → R–I

Swarts reaction:
R–Cl / R–Br + AgF → R–F

  1. From aromatic amines
    Sandmeyer reaction:
    Ar–N₂⁺ → Ar–Cl / Ar–Br
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