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Between fluorine anc chlorine attached to vinylic carbon,Which has more  m effect?, Between fluorine anc chlorine attached to vinylic carbon,Which has more  m effect?

Question asked by Prem Prasoon on Feb 9, 2016
Latest reply on Aug 5, 2017 by Guest

Between fluorine and chlorine which has greater +M effect when attached to vinyl group.

The confusion is, thiophene has almost twice the resonance energy of furan which encourage to think chlorine has better +M.

Now when we compare acidic strength of these two lewis acids BF3 and BCl3( latter on is stronger) it encourage to think fluorine has better +M effect than chlorine.

Kindly help me out..

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