For further practice on carbon levels find:
a) a three carbon species that has a carbon level of zero at each carbon atom.
b) two compounds that contain three carbon atoms and have a carbon atom with a carbon level of 1.
c) a compound that contain three carbon atoms and have a pair of carbon atoms with a delocalized carbon level of 1.
d) two compounds that contain three carbon atoms and have a carbon atom with a carbon level of 2.
e) two compounds that contain three carbons and have a carbon atom with a carbon level of 3.
f) a compound that have a carbon atom of carbon level 4.