CH4\mathrm{CH}_{4}CH4
C2H6\mathrm{C}_{2} \mathrm{H}_{6}C2H6
C3H8\mathrm{C}_{3} \mathrm{H}_{8}C3H8
C4H10\mathrm{C}_{4} \mathrm{H}_{10}C4H10