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Asked in PMC Practice Test 12 (2021) 2021

Octane number of 2,2,4-trimethylpentane is?

Correct answer: A. 100

  • A. 100
  • B. 95
  • C. 9
  • D. 89

Explanation

The octane number is a measure of a fuel's ability to resist knocking or detonation during combustion in an internal combustion engine. It is compared to a scale where n-heptane has an octane number of 0 and iso-octane (2,2,4-trimethylpentane) has an octane number of 100. Iso-octane (2,2,4-trimethylpentane) is chosen as the reference fuel because it exhibits very good anti-knocking properties. When a fuel has an octane number of 100, it means that it has the same knocking resistance as iso-octane.

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About Alkanes

Alkanes are saturated hydrocarbons containing only carbon-carbon and carbon-hydrogen single bonds, with the general formula CnH2n+2 for open chains. Their structure, isomerism, IUPAC nomenclature, physical properties, combustion, free-radical halogenation and conformations are covered, including the difference between substitution in alkanes and addition in unsaturated hydrocarbons.

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