Previously, I explored deviation from ideal tetrahedral arrangements of four carbon ligands around a central (sp ³ ) carbon using crystal structures. Now it is the turn of digonal (sp ¹ ) and trigonal (sp ² ) carbons.  Firstly, the digonal C≡C case. Attached to each carbon of the C≡C unit are two saturated carbon ligands; this to prevent conjugation from influencing our result.