What does n mean in n-pentane CAS 109-66-0?

CAS 109-66-0 n-Pentane is a colorless liquid at room temperature and pressure, with a characteristic odor of gasoline. It is highly flammable and volatile, meaning that it can easily catch fire and evaporate. It is also insoluble in water, but soluble in most organic solvents. n-Pentane has a boiling point of 36°C and a melting point of -130°C, making it one of the lowest boiling and melting alkanes.

What does "n" mean in n-pentane CAS 109-66-0?

The "n-" stands for "normal." In organic chemistry, this prefix indicates that the molecule has a straight-chain, unbranched structure of carbon atoms. For pentane (C₅H₁₂), "n-pentane" specifically refers to the isomer where all five carbon atoms are connected in a continuous chain: CH₃-CH₂-CH₂-CH₂-CH₃.

N-Pentane Structure:

Is CAS 109-66-0 n-pentane hazardous?

Hazard statements: 225, 304, 336, 411

Precautionary statements: 210, 261, 273, 280, 301+310, 331

Signal word: Danger

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