Fine Chart

No Heteroatoms:

	Allenes, Cumulenes	V/2 a; IV/1 d; VI/1 a; XIII/1, 2 a

See also:

General Chart			Cyclopropenes Cyclobutenes Cyclobutadiens
Arenes Arines	Hetarenes	Carboxylic p-electron systems	Saturated hydrocarbons