# Question #eb1e2

Aug 22, 2015

The common name is vinylcyclohexane.

#### Explanation:

I believe the structure you are thinking of is this:

The base name is cyclohexane, because the ring has more carbon atoms than the side chain.

The IUPAC name for the ${\text{-CH=CH}}_{2}$ group is "ethenyl", so the IUPAC name of the compound is ethenylcyclohexane.

But practically nobody calls it by that name.

Instead, they use the "common name" for the ${\text{–CH=CH}}_{2}$ group — vinyl.

The common name is therefore vinylcyclohexane.