what is the formula for Aldehyde?

an aldehyde is a substance containing the CHO group at the end of a hydrocarbon chain. There can be many different forms. One, for example, is C2H4O

O
&nbsp\\
&nbsp&nbspC-R
&nbsp&nbsp|
&nbsp&nbspH
I hope this turns out right.
R is some organic chain.

It looks ok to me.