Tetrahedral shape (e.g., methane), involves single bonds.
Trigonal planar shape (e.g., ethene), involves double bonds. sp: Linear shape (e.g., ethyne), involves triple bonds. Basic Principles of Organic Chemistry
Atoms share electron pairs. These can be sigma ( ) bonds (single bonds) or pi ( ) bonds (found in double and triple bonds). 2. Electronic Effects (The "Six Pillars") Tetrahedral shape (e