(Solved): 1. Build a model of 2 -methylpentane. Sight down the \( \mathrm{C}-2 \) to \( \mathrm{C}-3 \) bond. ...

1. Build a model of 2 -methylpentane. Sight down the \( \mathrm{C}-2 \) to \( \mathrm{C}-3 \) bond. a) Draw all possible Newman projections \( \left(0^{\circ}-360^{\circ}\right) \) for this molecule. b) Which projection(s) is/are the lowest energy and which is/are the highest energy? Refer to the table below for some help. c) Without calculating exact energy costs, plot potential energy vs, rotation angle for this molecule. 2. 1,3-diethylcyclohexane can exist as a cis and a trans isomer. a) Draw both conformers for cis-1,3-diethylcyclohexane, indicate which conformer if either is more stable (lower in energy) b) Draw both conformers for trans-1,3-diethylcyclohexane, indicate which conformer, if either, is more stable (lower in energy) c) Based on your answers in part a and b, which isomer, cis or trans-1,3diethylcyclohexane is lower in energy? Briefly explain your answer. Hint: look at the energies of the conformers for each isomer. Does one isomer have a conformer that has very few interactions?