How are structural isomers drawn?
Through many hours of hard practice!
Structural isomers have the same molecular formula, but different constitutions (e.g. connectivity of atoms).
It can have a double bond or a cyclic connection among the carbons (or oxygen, for that matter). I'll draw a few, but there are many constitutional isomers, on average,
That took me five minutes, and I'm sure there are more I missed (like a carbonyl