C3H2\mathrm{C}_{3} \mathrm{H}_{2}C3H2
C4H10\mathrm{C}_{4} \mathrm{H}_{10}C4H10
C4H8\mathrm{C}_{4} \mathrm{H}_{8}C4H8
C10H12\mathrm{C}_{10} \mathrm{H}_{12}C10H12