Question

How would you name the following:

\[\begin{array}{cc}
\ce{CH3 - CH2 - C = O}\\
\phantom{...............}|\\
\phantom{...............}\ce{H}\\
\end{array}\]

Answer 1

The structure contains 3 carbon atoms with a terminal –CHO (aldehyde group). Hence, its IUPAC name is propanal.