Structural Isomerism

Structural isomers are compounds with the same molecular formula but different structural formulae.Chain isomers have different arrangements of the carbon skeleton. For example, butane CH₃CH₂CH₂CH₃ and 2-methylpropane CH₃CH(CH₃)CH₃ are both C₄H₁₀.Position isomers have the same carbon skeleton and functional group, but the functional group is on a different carbon. For example, propan-1-ol and propan-2-ol, or 1-chlorobutane and 2-chlorobutane.Functional group isomers have different functional groups. For example, propanal CH₃CH₂CHO and propanone CH₃COCH₃ are both C₃H₆O. Hex-1-ene and cyclohexane are both C₆H₁₂.