IUPAC Prefixes for Naming Carbon Chains

Meth-

1 C atom

Eth-

2 C atoms

Prop-

3 C atoms

But-

4 C atoms

Pent-

5 C atoms

Hex-

6 C atoms

Hept-

7 C atoms

Oct-

8 C atoms

Non-

9 C atoms

Dec-

10 C atoms

Undec-

11 C atoms

Dodec-

12 C atoms

Tridec-

13 C atoms

Tetradec-

14 C atoms

Pentadec-

15 C atoms

Hexadec-

16 C atoms

Heptadec-

17 C atoms

Octadec-

18 C atoms

Nonadec-

19 C atoms

Eicos-

20 C atoms