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What is the Structural Formula of Pentane and Hexane?

Pentane (C₅H₁₂) is commonly represented
by the structural formula below (see isomers)

and hexane (C₆H₁₄) 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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