MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic 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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