Resonance/Mesomeric
Effect:
The
resonance or mesomeric effect refers to the polarity produced in a molecule as a result of
interaction two π-bonds or between a π-bond and a lone pair of
electrons. This effect operates through π-electron delocalization and is
transmitted along a chain of conjugated bonds.
Or
This is the movement
of electrons in a molecule where the electrons can shift between atoms or
bonds. This shift of electrons creates resonance structures, leading to
stabilization.
