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6.16 CH₃ a) b) C=N c) C-CH₃ d) CH₃ 6.17 a) Z b) Z c) Z d) E 6.18 The energy versus dihedral angle plot for 2-methylpropane is similar to that of propane shown in problem 6.5, with the exception that the energy difference between the high and the low energy conformers of 2-methylpropane is larger than that for propane because it has two methyl-hydrogen eclipsing interactions. 6.19 Energy 00 60° 120° 180° 240° 300° 360° Dihedral Angle CH₃ H CH CHI CH₃ H H CH₃ H CH₃ H CH₃ H H ÇH₃ H CH₃ CH₃ H H CH₃ CH₃ H H CH₃ CH₃ H 88