The longest continuous chain of carbons is called the . an organic compound containing only hydrogen and carbon is called a/an . sometimes an organic formula is written with a/an which is a shorthand notation that represents a hydrocarbon side chain.4. a hydrocarbon compound that contains multiple bonds is said to be a/an . some molecules have the same chemical formula but a different bonding pattern. these molecules are referred to as . a hydrocarbon that contains only single bonds is called a/an . an aromatic ring structure with the formula of c6h6 is called . ethene is an example of a/an . the cis and trans isomers are also called because their atoms are arranged differently with respect to their double bonds.