The formation of free radicals in the organic reaction takes place when the bond is cleavage homolytically. Free radicals are species with a single electron and thus, they are electron deficient in nature.
A free radical may be primary, secondary or tertiary depending upon the number of H-atoms attached to it. Further, the free radicals may be categorized as alkyl, allyl or benzyl radicals.
Primary free radicals: When radical is attached to two H-atoms.
Secondary free radicals: When radical is attached to one H-atoms.
Tertiary free radicals: When radical is not attached to any H-atoms.
Allylic free radicals: When radical is attached to two H-atoms and is in conjugation (resonance) with double bond.
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