n-Heptane molecular representations

n-Heptane is a straight-chain saturated hydrocarbon (normal alkane) with the molecular formula C₇H₁₆, consisting of seven carbon atoms in an unbranched chain. A colorless, highly volatile and flammable liquid with a faint petroleum-like odor, it occurs naturally in crude oil (0.1–1.9%) and is a major component of straight-run naphtha and gasoline. It is best known industrially as the zero-point reference fuel on the octane rating scale — pure n-heptane is assigned an octane number of 0 by definition, representing the poorest knock resistance — and as a widely used non-polar solvent.

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