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21 June, 13:50

The barrier to C-C bond rotation in iodoethane is 13 kJ/mol. What energy can you assign to an H-I eclipsing interaction?

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  1. 21 June, 16:05
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    5J/mol

    Explanation:

    H-H eclipsed = Torsional strain = 4.0 kJ/mol

    H-CH3 eclipsed = Mostly torsional strain = 6.0 kJ/mol

    CH3-CH3 eclipsed = Torsional and steric strain = 11.0 kJ/mol

    CH3-CH3 gauche = Steric strain = 3.8 kJ/mol

    You know each H-H eclipsed is 4 kJ/mol (8 kJ/mol total) and the reported barrier is 13 kJ/mol. Therefore the H-I eclipsed interaction must be 5 kJ/mol, (13-8 = 5).
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