If a carbon atom is bonded to two hydrogen atoms and two carbon atoms, what type of bond must exist between the carbon atoms?

A double bond must exist between two carbon atoms if bonded to two hydrogen atoms. This is because the two carbon atoms share electrons and are in itself a covalent bond. Because they are bonding to the hydrogen atoms it is a double bond.I hope that my answer is helpful! Let me know if you need something more :)

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