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What are the Isomers of Pentene?

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.

Pentene (C5H10) is commonly represented by the
molecule pent-1-ene which has the structural formula

Pent-1-ene Isomer of Pentene


Other isomers of pentene 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 pentene are pent-2-ene
represented by the structural formula

Pent-2-ene Isomer of Pentene


2-methylbut-1-ene, represented by the structural formula

2-methylbut-1-ene Isomer of Pentene


3-methylbut-1-ene, represented by the structural formula

3-methylbut-1-ene Isomer of Pentene


and 2-methylbut-2-ene, represented by the structural formula

2-methylbut-2-ene Isomer of Pentene

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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