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What is the Structural Formula of Pentene and Hexene?

Pentene (C₅H₁₀ see isomers) is
commonly represented by the structural formula

and hexene (C₆H₁₂) by the structural formula

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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