Carbene, R2C
Contains divalent, carbon atom. Produced by protolysis of Diazo alkanes.
Carbide
a binary compound of carbon with an element more electropositive than carbon; carbon-hydrogen compounds are excluded
Carbon dioxide, CO2
a colourless, odourless nonflammables gas formed when carbon burns in excess oxygen. It is also produced by respiration. Carbon dioxide is present in the atmosphere (0.03$ by volume) and is converted in plants to carbohydrates by photosynthesis.


