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What is the Structural Formula of Propane and Butane?

Propane (C₃H₈) is commonly represented
by the structural formula

and butane (C₄H₁₀ see isomers)
is commonly represented by the structural formula

where the single lines between the atoms
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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