<unk> s (also called naphthenes) are chemicals with one or more hydrogen rings to which carbon atoms are attached according to the formula CnH2n.<unk> s with a single ring are named analogously to their normal alkane counterpart of the same carbon count:  cyclopropane, cyclobutane, cyclopentane, cyclohexane, etc.  The larger<unk> s, with greater than 20   carbon atoms are typically called cycloparaffins.<unk> s are classified into small, normal and bigger<unk> s, where cyclopropane and cyclobutane are the small ones, cyclopentane, cyclohexane, cycloheptane are the normal ones, and the rest are the bigger ones.
Cycloalkane
Vinyl ether
Haloalkane
Ether
Benzene
Cyclohexane
Vinyl chloride
Acetylene