(Solved): The conformational diagrams for propane and 1-bromopropane are shown below. Knowing that an eclips ...

The conformational diagrams for propane and 1-bromopropane are shown below. Knowing that an eclipsed \( \mathrm{H} \)-H interaction is about \( 4 \mathrm{~kJ} / \mathrm{mol} \), estimate both the energy of a bromine-methyl eclipsed interaction and bromine- \( \mathrm{H} \) eclipsed interaction. (Hint: Draw Newman projections for all eclipsed conformations of each. What points on the energy diagrams do these correspond to, and what eclipsed interactions are occurring in each?) \( \mathrm{Br}-\mathrm{CH}_{3}=7 \mathrm{~kJ} / \mathrm{mol} ; \mathrm{Br}-\mathrm{H}=3 \mathrm{~kJ} / \mathrm{mol} \) \( \mathrm{Br}-\mathrm{CH}_{3}=13 \mathrm{~kJ} / \mathrm{mol} ; \mathrm{Br}-\mathrm{H}=5.7 \mathrm{~kJ} / \mathrm{mol} \) \( \mathrm{Br}-\mathrm{CH}_{3}=7 \mathrm{~kJ} / \mathrm{mol} ; \mathrm{Br}-\mathrm{H}=5.7 \mathrm{~kJ} / \mathrm{mol} \) \( \mathrm{Br}-\mathrm{CH}_{3}=13 \mathrm{~kJ} / \mathrm{mol} ; \mathrm{Br}-\mathrm{H}=7 \mathrm{~kJ} / \mathrm{mol} \)