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Heptane is an organic chemical, specifically an alkane, with formula C7H16. Heptane has nine isomers. The n-heptane has by definition the octane rating 0, so it is undesirable in petrol (US:gasoline), because it burns in a way that often causes engine knocking, as opposed to octane, which delivers better performance.
| Alkanes | |||||||||||||||||||||||||||||||
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methane |
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ethane |
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propane |
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butane |
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pentane |
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hexane | |||||||||||||||||||||
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heptane |
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octane |
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nonane |
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decane |
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undecane |
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