Structural Isomers


- Consider compounds with the molecular formula C4H10.
- There are two valid structures that fit this molecular formula.

A linear structure: [n-butane] and
a branched structure: [iso-butane (or 2-methylpropane)]

- These two compounds are structural isomers, they have the same number of carbon atoms (four) and hydrogen atoms (ten), but the atoms are connected differently.

- Consider compounds with the molecular formula C4H9Br.
- There are four valid structures with this molecular formula.

- Two have linear carbon skeltons:

1-bromobutane: and 2-bromobutane:

- Two have branched carbon skeletons:

1-bromo-2methylpropane: and 2-bromo-2-methylpropane:

- Again, these four compounds are all structural isomers of each other. They contain the same number and tyeps of atoms, but the atoms are connected differently.


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