# RCOH and RCHO Nomenclature [duplicate]

In terms of nomenclature, is there a difference between RCHO and RCOH when referring to an aldehyde?

## marked as duplicate by Todd Minehardt, Jan, Klaus-Dieter Warzecha, Wildcat, M.A.R.Nov 2 '16 at 19:56

$\ce{RCHO}$ is preferred. The problem with $\ce{RCOH}$ is that it gives the misleading impression that the hydrogen is attached to the oxygen. In fact, I don't believe I've ever seen a reference in literature to an aldehyde using the latter representation.
Therefore, a contracted label representing an aldehyde group should be written as $\ce{-CHO}$, since the carbon atom is bound to a hydrogen atom and a non-hydrogen (oxygen) atom, and the hydrogen should be presented adjacent to the first (carbon) atom, followed by the other (oxygen) atom.