Bond Lengths and Angles H 1.33A 1.54A 116.6° 121.79 ethylene ethane Angles approximately 120 Pi overlap brings carbon atoms closer: C-C bond length 1.54 A C=C bond length 1.33 A. Pi bonds weaker than sigma bonds 5 2013 Pearson Education Inc.Bond Lengths and Angles • Angles approximately 120° • Pi overlap brings carbon atoms closer: – C-C bond length = 1.54 Å – C=C bond length 1.33 Å. • Pi bonds weaker than sigma bonds 5 © 2013 Pearson Education Inc