![]() The choice between “reasonable” and “unreasonable” structures is often based on our chemical intuition.ġ3 Formal Charge Sometimes when dealing with different resonance structures with unequal energies, we can select the more likely structure on the basis of the formal charge.ġ4 Formal Charge Sometimes when dealing with different resonance structures with unequal energies, we can select the more likely structure on the basis of the formal charge. Consider only those structures in which most or all of the atoms obey the octet rule. Consider only those structures in which most or all of the atoms obey the octet rule.ġ2 3. (Sometimes this is not true – but in the cases where it is not, the relative weight of the resonance structure is usually small).ġ1 3. The same atoms must be bonded to one another in all the resonance structures. Rearrange electrons, but not the positions of the atoms. Rearrange electrons, but not the positions of the atoms.ġ0 Summary of rules for drawing resonance structures. This distance is between the length of a typical carbon-carbon single bond (1.54 Å) and that of a carbon-carbon double bond (1.33 Å).ĥ Examples: Draw the resonance structures for ozone (O3) and dinitrogen tetraoxide (N2O4).Ĩ Summary of rules for drawing resonance structures.ĩ Summary of rules for drawing resonance structures. ![]() Presentation on theme: "Benzene C6H6 This is a very important example in organic chemistry C C C C C C."- Presentation transcript:ġ Benzene C6H6 This is a very important example in organic chemistry C C C C C CĢ Benzene C6H6 This is a very important example in organic chemistry C C C C C CĤ The distances between adjacent carbon atoms in benzene are all the same and are equal to 1.40 Å. ![]()
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