Wize University Chemistry Textbook > Introduction to Organic Chemistry
Structural (Constitutional Isomers)
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Constitutional Isomers
- Chemical isomers are molecules that have the same molecular formula, but a different chemical structure
- Structural (or constitutional) isomers are molecules that have the same molecular formula, but the bonding in the two molecules is different
- Both molecules above have a molecular formula of , but have very different structures. They are constitutional isomers
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Example: Identifying Isomers
Decide whether the following pairs of compounds are Identical, structural isomers or unrelated to one another.
Wize Tip
This is a question that is commonly seen on exams!
Identical
Identical
Structural Isomers
Unrelated
Practice: Number of Constitutional Isomers
The compound C3H6Cl2 has how many structural (constitutional) isomers?
Practice: Identifying Constitutional Isomers
The alkane pentane, C5H12, has several structures (i.e. constitutional isomers, all of which are included in the set of molecules shown below.
Which of the following sets of structures presents the isomers of pentane without counting any isomer more than once?
Practice: Hydrocarbon Isomers
Choose the compound below which is a structural isomer of 2,2-dimethylpentane