Another TBR bond strength question

[silverice]

Why is the bond in Vinyl-Me is stronger than the bond in Vinyl-Et?

Why is the bond in Et-Me is stronger than the bond in Et-Et?

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[silverice]

Why is the bond in Vinyl-Me is stronger than the bond in Vinyl-Et?

Why is the bond in Et-Me is stronger than the bond in Et-Et?

No one answered??? Please guys....................... Help me out here .

 

[ouroboros39]

Ive got to leave really quick here, but the short answer I can give is that when you look that the stability of the product, a radical, an ethyl radical is more stable than a methyl radical (hyperconjugation and such). The relative stability in this case means that homolytic cleavage would not be favorable for either, but it would be more unfavorable for a methyl compared to ethyl. The same logic can be used in both cases.