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How to Draw Isomers of Alkenes.

Changing the position of the double bond in an alkene
makes a different isomer.
Butene and pentene exist as different isomers.
Compare these with the isomers
of butane and pentane on the previous pages.

What are the Isomers of Butene?

Butene (C4H8) is commonly represented by the
molecule but-1-ene which has the structural formula

But-1-ene Isomer of butene


Other isomers of butene can be drawn by
changing the place of the double bond or by changing
the way that the carbon atoms are joined to each other.

The other isomers of butene are but-2-ene
represented by the structural formula

But-2-ene Isomer of butene


and 2-methylpropene, represented by the structural formula

2-methylpropene Isomer of butene

where the double lines between the carbon atoms
represent a double covalent bond.
The single lines represent single covalent bonds.

Note that each carbon atom has four bonds (valency 4),
and each hydrogen atom has one bond (valency 1).
Valency is the combining power of an atom.

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