Is it correct to assume that aromatic hydrocarbons are strictly cyclic compounds and aliphatic hydrocarbons are “linear” (either alkane, alkene, or alkyne)? (All aromatic compounds are cyclic, but not all cyclic compounds are aromatic. Aliphatic compounds also can be cyclic. - GS).

^^^How can you differentiate between the 2 then? (The difference is historical, not chemical, and will not be important for this course. - GS).

Would you say aromatic compounds are typically stable/ more stable than aliphatic? (Yes. - GS).