Write IUPAC names of the following compounds:

1-Methoxy-2-methylpropane

Longest carbon chain attached to oxygen is chosen. It is called the principal chain and the other carbon chain is named with -oxy(Alkoxy) suffix at the end. Now the position of alkoxy group is 1 w.r.t the principal chain(propane) and the methyl group

Is 2. Further alphabetically methoxy comes before methyl, therefore named as such.