| Step 1: Connect the carbon atoms: | C—C |
| Step 2: Add the oxygen atom to the carbon chain: | C—C—O |
| Step 3: Add hydrogen atoms last: |  |
| Step 1: Connect the carbon atoms: | C—C |
| Step 2: Add the oxygen atom to the carbon chain: | C—C—O |
| Step 3: Add hydrogen atoms last: | |