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Chemistry LibreTexts

Initiation

  • Page ID
    40492
  • A typical radical chain reaction consists of three types of steps:

    1. One initiation step
    An initiation step is a reaction in which radicals are generated from a stable, non-radical precursor. Initiation increases the concentration of radicals in the system.

    2. Two or more propagation steps
    A propagation step is a reaction in which a radical is consumed and a new radical is generated. Propagation does not affect the concentration of radicals in the system.

    3. One or more termination steps
    A termination step is a reaction in which radicals are consumed but no new radicals are generated. Termination decreases the concentration of radicals in the system.

    eg: Heat-induced reaction of excess methane with bromine