<P> In chemistry, a radical (more precisely, a free radical) is an atom, molecule, or ion that has an unpaired valence electron . With some exceptions, these unpaired electrons make free radicals highly chemically reactive . Many free radicals spontaneously dimerize . Most organic radicals have short lifetimes . </P> <P> A notable example of a free radical is the hydroxyl radical (HO), a molecule that has one unpaired electron on the oxygen atom . Two other examples are triplet oxygen and triplet carbene (: CH) which have two unpaired electrons . </P>

Due to presence of unpaired electron free radical are
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