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Order of bond energy in furan, pyrolle and thiophene

  • #1
Krushnaraj Pandya
Gold Member
697
71

Homework Statement


A bromo-methyl group is attached adjacent to the N,O and S atoms respectively in furan, pyrolle and thiophene, find correct order of bond energy required for heterolytic cleavage of CBr bond forming carbocation

2. The attempt at a solution

Lone pairs participate in resonance in all three, so I thought the only different thing is the elctronegativity of the atoms. Since Oxygen>Nitrogen>Sulphur in EN furan would be most unstable since it'd try to pull electrons from the already positive carbon so its bond energy should be highest, then pyrolle's then thiophene but this is incorrect. I'd appreciate some help, thank you
 

Answers and Replies

  • #2
Krushnaraj Pandya
Gold Member
697
71
Heres an image of the indicated question
 

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