Propene, CH3CH=CH2\text{CH}_3\text{CH}=\text{CH}_2CH3CH=CH2, is a member of the alkenes homologous series with a C=C\text{C}=\text{C}C=C double bond. What is the general formula of the alkenes?
CnH2n−2\text{C}_n\text{H}_{2n-2}CnH2n−2
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
