Ethylene, a gas found in nature, is commonly used to ripen bananas and other fruits. Which compound is ethylene? 2 C H 2 are single bonded to each other, and both are single bonded to the same O. A skeletal model with a chain beginning with O H, then line segments going up, down, up and ending at another O H. 2 carbons are double-bonded to each other; the pair are single bonded to H above left, above right, below right, and below left. Two carbons are triple bonded to each other; each is single bonded to H to the outside.