# Is CH2 an alkyl group?

Apr 19, 2018

Alone?

It's generally called a carbene, which is very reactive with alkenes, forming cyclopropane.

In a molecule? I would call it a (1) methylene.

Apr 19, 2018

$C {H}_{2}$ is either part of the carbon backbone (not something attached to it), i.e. $- C {H}_{2} -$, or (as the other poster commented) it could be in the form of a carbene, which is a highly reactive intermediate with two unshared valance electrons ($: C {H}_{2}$).