We’re being asked to approximate the bond angles of the two carbon atoms in glycine. Since we have the Lewis structure for glycine, we determine the electron geometry and bond angle using this:
Electron Regions Electronic Geometry Bond Angles
2 linear 180˚
3 trigonal planar 120˚
4 tetrahedral 109.5˚
5 trigonal bipyramidal 90˚, 120˚, and 180˚
6 octahedral 90˚ and 180˚
*Electron groups include lone pairs and atoms around the central atom
Consider the Lewis structure for glycine, the simplest amino acid:
What are the approximate bond angles about each of the two carbon atoms?
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