Calculate strain energy for the conformer pictured below, using strain energy in

Question

Calculate strain energy for the conformer pictured below, using strain energy increments from the table.

Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction Compound kJ/mol kcal/mol 4.0 1.0 H H eclipsing H CH3 eclipsing CH3:CH eclipsing 11.0 26 3.8 0.9 gauche butane 115 275 cyclopropane 110 263 cyclobutane 260 6.2 cyclopentane 26.2 6.3 cycloheptane 40.5 97 cyclooctane (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcaVmol. The answer is case sensitive.) H3C ball & stick. labels Strain energy

Explanation / Answer

1) we have no gauche interactions and no eclipsed here hence energy = 0

2) CH3-CH3 eclisped + 2 H-H eclipsed = 11 + 2( 4) = 19 KJ/mol

3) we had 1 H-H eclipsed and 2 H-CH3 eclipsed = 4+ 2( 5.8) = 15.6 KJ/mol

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