Es lo primero que debes buscar para saber cómo termina el nombre.

| Mistake | Typical exercise correction | |---------|-----------------------------| | Not choosing the longest chain | Exercises with hidden longer chains (e.g., a branched alkane that looks like a hexane but is actually a heptane) | | Incorrect numbering | Exercises with multiple substituents where the first difference rule must be applied | | Forgetting double/triple bond priority | Mixed exercises with alkene and alcohol (the alcohol gets the lower number) | | Misusing prefixes (di, tri, etc.) | Alphabetical order exercises (e.g., 3-etil-2,4-dimetil...) |

10. Un hexágono (ciclo de 6) con un doble enlace a un oxígeno ( =Oequals cap O Consejos para el examen

Is 2-etilpropano correct? Solution: No. The longest chain is butane (4 carbons), so the correct name is butano (or 2-methylbutane if structure is different). This teaches students to find the longest continuous chain .