Final answer:
The IUPAC name for the compound c2h5-o-ch2-c(ch3)3 is ethoxy-2-methylpropane, which includes an ethoxy group and a tert-butyl group.
Step-by-step explanation:
The molecule given can be described as an ether with an ethoxy group attached to a tert-butyl group. The IUPAC name consists of naming the two parts of the ether separately as substituents. The ethoxy part is straightforward, while the tert-butyl is considered a substituent branching off the main chain. We name the longest carbon chain attached to the ether group, which in this case is a single carbon, like methane. However, as there is a tert-butyl group attached to it, this carbon is effectively part of a four-carbon tert-butyl group. The IUPAC name thus becomes ethoxy-2-methylpropane.