a) Draw three constitutional isomers of C5H12. b) Draw the stereoisomers of C4H8 and provide the name for each. c) Draw the most stable Newman projection for 2-iodopropane. d) Label the conformer as either (R,R), (R,S), or (S,S).

Sight along the C2-C1 bond of 2-methylpropane (isobutane).(a) Draw a Newman projection of the most stable conformation.(b) Draw a Newman projection of the least stable conformation.(c) Make a graph of energy versus angle of rotation around the C2-C1 bond.(d) Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 4.0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.

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Sighting along the appropriate C-C bond of neopentane C(CH3)4: a) Draw its Newman projections. b) How much energy does the most unstable conformation possess? c) Make the energy diagram for the different conformers.