MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryGOCIntroduction of Reaction Intermediates

Arrange the following free radicals in order of decreasing stability. Methyl (I), Vinyl (II), Allyl (III), Benzyl (IV)

A.I > II > III > IV

B.III > II > I > IV

C.II > I > IV > III

D.IV > III > I > II✓ Correct

Explanation

The general order of stability of free radicals is given as- Benzyl > Allyl > o o o 3 3 >2 >1 >CH > Vinyl > Phenyl The resonating structure of benzyl free radical is shown below- Similarly, the resonating structure of allyl free radical is- And the vinyl free radical is unstable as it’s electron density is high due to double band as well as one electron ( 2 CH CH ) Thus, the correct option is (d) IV>III>I>II

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