8. Draw all resonance structures of the following compounds. Show electron-pushing arrows. For each, which resonance structure contributes the most to the resonance hybrid? NH
Electronic Effects
The effect of electrons that are located in the chemical bonds within the atoms of the molecule is termed an electronic effect. The electronic effect is also explained as the effect through which the reactivity of the compound in one portion is controlled by the electron repulsion or attraction producing in another portion of the molecule.
Drawing Resonance Forms
In organic chemistry, resonance may be a mental exercise that illustrates the delocalization of electrons inside molecules within the valence bond theory of octet bonding. It entails creating several Lewis structures that, when combined, reflect the molecule's entire electronic structure. One Lewis diagram cannot explain the bonding (lone pair, double bond, octet) elaborately. A hybrid describes a combination of possible resonance structures that represents the entire delocalization of electrons within the molecule.
Using Molecular Structure To Predict Equilibrium
Equilibrium does not always imply an equal presence of reactants and products. This signifies that the reaction reaches a point when reactant and product quantities remain constant as the rate of forward and backward reaction is the same. Molecular structures of various compounds can help in predicting equilibrium.
A resonance structure is the depolarization of its conjugated lone pairs or pi - electrons.
While writing a resonance structure it's number of bonds and the number of lone pairs remains unchanged.
Also, no sigma bond should be broken.
Stability of the resonance structures:
1. Neutral molecule is most stable.
2. The molecule which have complete octet for each elements.
3. The charge localization, the negative charge should be on the more electronegative element while the positive charge should be on the less electronegative element.
4. There should be least separation between two opposite charges. But, there should be most separation between similar charges.
The structure which is most stable contribute most to the resonance hybrid.
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