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Bond dissociation enthalpy needed to form benzyl radical from toluene as compared to formation of methyl radical from methane is less or more or equal ? Why ?

Asked by anirbanbag81 14th December 2017, 4:10 PM
Answered by Expert
Answer:
begin mathsize 18px style space space space space space space space CH subscript 4 space rightwards arrow with blank on top space CH subscript 3 bullet space space plus space straight H bullet
space Methane space space space space space space space space space space Methyl space radical space space space space space space space space space space space space space space space space space space space space space space space space space space space space space triangle straight H space equals space 104 kcal

space space space space space space space straight C subscript 6 straight H subscript 5 CH subscript 3 space space end subscript rightwards arrow with blank on top space space straight C subscript 6 straight H subscript 5 CH subscript 2 bullet space space space plus space space straight H bullet
space space space space Tolune space space space space space space space space space space space space space space space space space space Benzyl space radical space space space space space space space space space space space space space space space space space space space space space space triangle straight H space equals space 85 kcal

Bond space dissociation space energies space indicate space that space 19 space kcal space less space energy left parenthesis 104 minus 85 right parenthesis space is space needed space to space form space the space benzyl space radical space from space tolune space than
to space form space the space methyl space radical space from space merthane.
This space is space because space the space stability space of space benzyl space radical space is space more space than space that space of space methane space because space of space resonance space effect.
This space resonance space causes space stabilisation comma space that space of comma space lowers space the space energy space of space content. end style
Answered by Expert 18th December 2017, 6:22 PM
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