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Barriers to Internal Rotation

Which torsion in CHONH2?

picture of formamide
Please choose which four atoms describe the torsional coordinate.
choose Atom1 Atom2 Atom3 Atom4 Type of Rotor explanation
torsion 1 2 1 3 5 NH2 NH2 inversion causes kink
torsion 2 2 1 3 5 NH2 wag NH2 inversion