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What is the stability order of various a...

What is the stability order of various alkyl free radicals ? Why?

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The stability order of alkyl free radicals is:
`underset(3^0)((CH_3)_(3))overset(*)Cgtunderset(3^0)((CH_3)_(2))overset(*)CHgtunderset(1^0)(CH_3)overset(*)CH_2gtCH_3`
More the number of hyperconjugative structures , the greater is the stability . Tertiary butyl free radical has 9, Isopropyl free radical has 6, cthyl free radical has 3 and methyl free radical has no hyper-conjugative structures.
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