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Which has higher resonance energy ch2=ch-f or ch2=ch-br?

Which has higher resonance energy ch2=ch-f or ch2=ch-br?
 

Grade:12

3 Answers

Ramreddy IIT Patna
askIITians Faculty 49 Points
8 years ago
ch2=ch-br has high resonance energy because lone pairs on Br involve in resonance easily giving more delocalization and hence more resonance energy. Flourine is more elctronegative thats why lone pairs present on it does not involve in delocalization effectively.
agam goel
35 Points
8 years ago
the other one has more resonance energy
 
daksh
13 Points
8 years ago
yes the other one has more resonance energy because resonanance is more effective in C-F bond than in C-Br bond

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