All alkyl groups

Includes butyl and propyl groups

propyl

alkyl attach the parent chain at end of molecule

isopropyl

propyl is attached in the middle

butyl (n-butyl)

butyl is attached at end of alkyl

sec-butyl

attach to parent chain at a second degree carbon

tert-butyl

3 carbons branch off carbon attached to parent chain (makes a T shape)

isobutyl

3 carbon line attached to carbon atom attached to parent chain

methyl/methane

1 carbon (mono)

ethyl/ethane

2 carbons (di)

propyl/propane

3 carbons (tri)

butyl/butane 

4 carbons (tetra)

pentyl/pentane

5 carbons (penta)

hexyl/hexane

6 carbons (hexa)

heptyl/heptane

7 carbons (hepta)

octyl/octane

8 carbons (octa)

nonyl/nonane

9 carbons (nona)

decyl/decane

10 carbons (deca)