Alkenes and alkynes exhibit skeletal isomerism in which the carbon chain is. alkanes, alkenes, alkynes, aromatic hydrocarbons, carboxylic acids, aldehydes, ketones,. compare the number of monovalent atoms to the number of carbons. Ignore oxygen. Ignore nitrogen, but subtract one hydrogen or monovalent atom from.
Alkanes have single bonds, alkenes contain a carbon-carbon double bond, and alkynes have a carbon-carbon triple bond. Also, alkanes are labelled as saturated hydrocarbons, while alkenes, alkynes, and aromatic hydrocarbons are said to be unsaturated. There are many properties of hydrocarbons, one of which is combustibility.