Difference between resonance effect and mesomeric effect
Answers
Resonance, the term refers to the representation of the electronic structure of a molecular entity in terms of contributing structures. Resonance among contributing structures means that the wavefunction is represented by 'mixing' the wavefunctions of the contributing structures. The concept is the basis of the quantum mechanical valence bond methods. The resulting stabilization is linked to the quantum mechanical concept of 'resonance energy'. The term resonance is also used to refer to the delocalization phenomenon itself.
Mesomerism Essentially synonymous with resonance. The term is particularly associated with the picture of π-electrons as less localized in an actual molecule than in a Lewis formula. The term is intended to imply that the correct representation of a structure is intermediate between two or more Lewis formulae.
Answer:
The core difference between resonance and the mesomeric effect is that the resonance effect outline how the lone electron pair and bond electron pair of a molecule determine the chemical structure of the molecule whereas the mesomeric effect describes the stabilization of a molecule by use of a functional group.