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What is the Structural Formula of Propane and Butane?

Propane (C3H8) is commonly represented
by the structural formula

Propane Structural Formula

 

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

Butane 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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