How the following two structures are chain isomers?
According to what I have studied in nomenclature when a compound has both cyclic and straight chain, we consider that the chain as parent chain according to the following order:
- functional group;
- multiple bonds;
- maximum number of carbons.
Following the above order, I came to the conclusion that both structures have benzene as their parent chain. Since both have benzene, then how they come to be chain isomers?
Please explain to me in simple terms because I am just a beginner.