Answer:
Double carbon-carbon bond.
Step-by-step explanation:
This is composed of a covalent bond between two carbon atoms. This bond is made up of two electrons that is one electron each from the two atoms.
These atoms have the possibility of forming double bond in atoms like alkalies. These double bond have eight valance electron .
The double bonds which involve carbon are very stronger than the single bonds and they are also much shorter.
Since they are potentially more reactive they are electron rich in nature
Hope this helps!
If not, I'm sorry I couldn't help :(