Question

Question #eb1e2

Answer 1

The common name is vinylcyclohexane.

Explanation:

I believe the structure you are thinking of is this:

(fromwww.lookchem.com)

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

The IUPAC name for the `"-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 `"–CH=CH"_2` group — vinyl.

The common name is therefore vinylcyclohexane.