16. For the following Newman projections: ( 6pt total) a. rank them in stability from 1 to 4,1 being most stable b. identify the "anti", "gauche", and the "totally eclipsed" conformations. c. Is the energy difference between the gauche and the anti conformation based on steric strain, torsional strain, or angle strain? d. In the case of ethane (not shown), staggered conformations are better than eclipsed conformations. Is the difference based on steric strain, torsional strain, or angle strain