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drill_set2_sol

drill_set2_sol - Solutions to 5.13 Drill Problems for IR...

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Solutions to 5.13 Drill Problems for 9/17/03-9/24/03 IR Spectroscopy 1. [ a > b ] because the difference in mass across the C=C double bond is greater in a than in b. 2. [ b > c > a ] because a CO triple bond is stronger than a CO double bond, which is stronger than a CO single bond, and the difference in mass ratios is negligible. In other words, the spring constant is bigger – the spring is tighter! 3. [ a > b ] because Fe is much heavier than C. Put something really heavy on one end of a spring – it then bounces back and forth much more slowly! 4. [ a > b > c ] because a C(sp 3 )-H bond is stronger than a C(sp 2 )-H bond, which is stronger than a C(sp)-H bond. Greater p-character puts electrons further away from the carbon nuclei, giving the C-H bonds more covalent character (and thus strength). 13 C NMR 1. [ a < b < c ] because chemical shift goes down with increasing electron density (shielding). Li is best at stabilizing a positive charge, so the Li-C bond is the most polarized of the three. In other words, of the three molecules, MeLi puts the biggest partial negative
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