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 your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.)

Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H : H eclipsing 4.0 1.0 H : CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7

Explanation / Answer

a. This is the staggered conformation of neopentane , which has zero strain energy due to no interaction among groups

b. This is also gauche coformer of hexane: Free of strain energy

c. gauche of butane : so strain energy is : 3.9 Kcal / mol

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