Rotational Ranking - smallest. This is surprising since...

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Rotational Ranking Interaction Type Eclipsed/kcal Staggered/kcal Cl → Cl 23.00 5.037 CH 3 → CH 3 18.29 3.043 CH 3 → Cl 17.41 2.008 CH 3 → H 5.37 1.506 H → H 3.91 0.818 The energy of interaction increases with the increased size of the group. So an ethyl group will have more energy of interaction than a methyl group (4.430 compared to 3.043). But, the same is NOT true for halogens. In order of staggered interactions, we have the following, F→F < I→I < Br→Br < Cl→Cl 2.778 2.828 4.568 5.037 So the Cl→Cl interaction is the largest interaction between the halogens and the F→F is the
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Unformatted text preview: smallest. This is surprising since fluorine is the most electronegative element on the Periodic Table but it is also small and this helps make the energy of interaction smaller. Iodine on the other hand is quite large and you might expect its energy of interaction to be quite large but it is not. The reasons for this are not entirely clear, but it probably has something to do with the stabilizing effect of d-orbital overlap....
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This note was uploaded on 02/07/2012 for the course CHEM 1 taught by Professor Gelfand during the Spring '11 term at Solano Community College.

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