quiz 2 key - orgo - 5 Acid A has a pKa of 6 Acid B has a...

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Chem 221 Quiz 2 KEY 1. Indicate whether the following molecules are polar or non-polar. F F OH non-polar polar 2. Which of the molecules in problem 1 would have the strongest intermolecular forces? Circle your choice. Dipole-dipole interactions are much stronger than dispersion forces, so the polar molecule with have much stronger non-covalent intermolecular forces. 3. In the space provided, draw as many resonance structures as you can for each of the following species. O benzene H a) b) c) O H O H "best" resonance structure (neg. charge is on an electronegative oxygen) 4. For problem 3c) indicate the resonance structure that would contribute most to the actual structure.
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Unformatted text preview: 5. Acid A has a pKa of 6. Acid B has a pKa of 4. Based on this information, complete the following statement: "Acid __ B ___ is __ 100 ___times more acidic than Acid __ A __." 6. 1,3-Cyclohexadione (shown below), has a surprisingly low pKa of 5.3. On the structure shown below, indicate which carbon has the most acidic hydrogens. Briefly explain your choice. O O O O O O Upon deprotonation, this conjugate base has two carbonyl groups to delocalize negative charge, making the circled protons the easiest to remove (i.e. the most acidic). O O...
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