A b c d o o o o o o 5 vb vs mo theory both describe

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A B C D O O O _ O O O _ + +
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5 VB vs. MO Theory: Both describe electronic structure of molecules Both are built out of atomic orbitals (AOs) VB has localized bonding; MO has whole molecule orbitals (delocalized electrons) VB produces hybrid orbitals MO has HOMO/LUMO—important orbitals that describe polar reactions and acid/base reactions Resonance fixes static VB/Lewis drawings VB hybrids trigger an immediate association of geometry MO is used to calculate electrostatic maps, provide insights into reactivity, and the nature of orbitals involved with the chemistry The vector sum of the magnitude and the direction of the individual bond dipole determines the overall dipole moment of a molecule Molecular Dipole Moment
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6 Electrostatic Potential Maps Formal Charge = # valence e - - # of bonds - # of non-bonding e - (lone pair e - ’s) Remember Formal Charges –
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7 Acids and Bases 1. Most chemical reactions can be treated as acid- base reactions 2. The trends in acidity correspond to trends in reactivity 3. We can quantify acidity so this gives us a numerical framework for understanding organic chemistry 4. The protonation state of a molecule determines its reactivity - in each step of almost every mechanism, we need to know the protonation state 5. Enzymatic catalysis in biological systems is most often acid-base catalysis Why are acids and bases so important in organic chemistry?
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