Sat February 11, 2012 By: Renu Suresh

Why electron density is more in ortho & para positions? Why meta position is unfavourable in most cases?

Expert Reply
Sat February 11, 2012
It depends on the functional group already present on the ring. If the group already present is activating, it will donate electron density to the ring pi-system. Through resonance this electron density will be available partly at o- and p-positions.
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