Acyclic hydrocarbons containing multiple C=C\text{C}=\text{C}C=C double bonds are known as polyenes. What is the general formula for a homologous series of acyclic polyenes that contain exactly three C=C\text{C}=\text{C}C=C double bonds per molecule?
CnH2n\text{C}_n\text{H}_{2n}CnH2n
CnH2n−2\text{C}_n\text{H}_{2n-2}CnH2n−2
CnH2n−4\text{C}_n\text{H}_{2n-4}CnH2n−4
CnH2n−6\text{C}_n\text{H}_{2n-6}CnH2n−6
