The general formula for the homologous series of alkanes is CnH2n+2\text{C}_n\text{H}_{2n+2}CnH2n+2. Which formula is the formula of an alkane?
C4H8\text{C}_4\text{H}_8C4H8
C5H12\text{C}_5\text{H}_{12}C5H12
C6H6\text{C}_6\text{H}_6C6H6
C7H14\text{C}_7\text{H}_{14}C7H14