मराठी

Methods of Preparation of Alkyl Halides

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Methods of Preparation of Alkyl Halides

  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:
    \[R—X+NaI\xrightarrow{Acetone}R—I+NaX\]
    Swart's reaction:
    \[RBr+AgF\longrightarrow R—F+AgBr\]
  5. From aromatic amines
    Sandmeyer reaction:
    \[\mathrm{C_{6}H_{5}NH_{2}}\xrightarrow{\mathrm{NaNO_{2}+HX}}\mathrm{C_{6}H_{5}N_{2}^{+}\bar{X}}\xrightarrow{\mathrm{Cu_{2}X_{2}}}\mathrm{C_{6}H_{5}X+N_{2}}\]
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