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What is an Isomer?
Isomers are compounds
the same molecular formula
but a different structural formula.
What is a Structural
The structural formula (also called the displayed formula)
shows how the atoms are joined together in the molecule.
Isomers of hydrocarbons have the same
of carbon and hydrogen atoms
but the carbon atoms are joined to each other in
different ways. Simply changing the shape of
the molecule does not make it a different isomer.
The isomers of butane are
shown on the next
Different isomers are different molecular compounds.
They will have different physical properties
(for example different boiling points).
The more carbon atoms a compound has,
the greater the number of isomers there can be.
Propane (3 carbon atoms) has 0 isomers.
Butane (4 carbon atoms) has 2 isomers.
Pentane (5 carbon atoms) has 3 isomers.
Hexane (6 carbon atoms) has 5 isomers.
Heptane (7 carbon atoms) has 9 isomers.
Octane (8 carbon atoms) has 15 isomers.
There are also isomers of alkenes and alcohols.
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