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What is the Structural Formula of Propene and Butene?

Propene (C₃H₆) is commonly represented
by the structural formula

and butene (C₄H₈ see isomers) 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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