What is the correct IUPAC name for the compound whose common name is -ethoxy- -methylbutyraldehyde?

Step-by-step solution

The common name is -ethoxy- -methylbutyraldehyde. The root word "butyraldehyde" indicates a continuous chain of 4 carbon atoms terminating in an aldehyde group ( - CHO ). In common nomenclature, the carbon adjacent to the aldehyde group is the -carbon (which corresponds to C2 in IUPAC numbering), and the next carbon is the -carbon (C3 in IUPAC). The name specifies a methyl group at the -position (C2) and an ethoxy group at the -position (C3). Constructing the structure gives: CH ₃- CH ( OCH ₂ CH ₃)- CH ( CH ₃)- CHO