Draw a formula for the lowest molecular weight compound that contains C, H, and possibly O, N or S, is a chiral compound, contains ONLY one functional group, and is a sulfide.
Pay attention to stereochemistry.
You do not have to explicitly draw H atoms, unless required to do so for stereochemistry.
If a group is achiral, do not use wedge or hashed bonds on it.
Alkene or alkyne groups are considered to be functional groups.