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Free Radical Reactions

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Free radical substitution reactions in alkanes and alkyl groups. Free radical addition during the polymerization of ethene and the reaction between HBr and alkenes in the presence of organic peroxides.

  • Bromination of Methane
    This page gives you the facts and a simple, uncluttered mechanism for the free radical substitution reaction between methane and bromine. This reaction between methane and bromine happens in the presence of ultraviolet light - typically sunlight. This is a good example of a photochemical reaction - a reaction brought about by light.
  • Chlorination of Methane
    This page gives you the facts and a simple, uncluttered mechanism for the free radical substitution reaction between methane and chlorine.
  • Methylbenzene and Chlorine
    This page gives you the facts and a simple, uncluttered mechanism for the free radical substitution reaction between methylbenzene (previously known as toluene) and chlorine.
  • What is Free Radical Substitution?
    Substitution reactions These are reactions in which one atom in a molecule is replaced by another atom or group of atoms. Free radical substitution often involves breaking a carbon-hydrogen bond in alkanes


This page titled Free Radical Reactions is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Jim Clark.

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