* Structural Isomers: Structural isomers have the same molecular formula but different arrangements of atoms.
* Butanol: All the butanols have the molecular formula C4H10O.
* Isobutanol: Isobutanol has a branched carbon chain with the hydroxyl group (OH) attached to a tertiary carbon.
* 1-Butanol and 2-Butanol: Both 1-butanol and 2-butanol have straight chains with the OH group attached to a primary (1-butanol) or secondary (2-butanol) carbon.
Therefore, isobutanol differs in its carbon chain structure compared to 1-butanol and 2-butanol, making it a structural isomer of both.
