In this example question, it asks to name the following ether compound. In order to accomplish this, we're going to utilize the following three steps. Step 1, we have to identify the two alkyl groups connected to our oxygen atom. So here is our oxygen atom, and we have this alkyl group connected to it, and this alkyl group connected to it. Here this has 1, 2, 3, 4 carbons, so this would be a butyl group, and this is only a methyl group.
Step 2: Name the two alkyl groups alphabetically as substituents. So here, we know we have a butyl and a methyl group connected to the oxygen. If there are identical alkyl groups, use the numerical prefix "di." Here they are not the same, so we don't have to say like "dimethyl" or "dibutyl." So we're going to say here, butyl, methyl.
Step 3: End the name of the compound with "ether," and then write the name with spaces. So there's a space between butyl and methyl, and then the end of the name ether. So this would be butyl methyl ether.