Step-by-step explanation:
Alkanes are hydrocarbons that have only single bonds and open chains, that is, they are saturated and acyclic. These compounds are also called paraffinic hydrocarbons or paraffins. The general formula for alkanes is CnH2n+2. Alkanes are responsible for forming oil and natural gas.
Alkenes are hydrocarbons that have a double bond in their carbon chain. The general formula for alkenes is: CnH2n. Most alkenes are produced in the laboratory and few are found in nature.
Alkynes are open-chain, unsaturated, low-density hydrocarbons. They are artificial organic compounds, obtained through the reaction between water and calcium carbide or by dehydrogenation of an alkene.
Aromatic hydrocarbons are organic compounds formed exclusively by carbon and hydrogen atoms. They must have a basic structure (aromatic ring or core) composed of:
closed chain
six carbon atoms
Three double bonds (formed by a pi bond and a sigma bond) alternating.
Answer: A. an alkane.