What is the octane number of Iso-octane?
Correct answer: B. 100
- A. 40
- B. 100
- C. Zero
- D. 2
Explanation
Octane number means the ability of any fuel to resist knocking when it is ignited in a mixture of air. N-heptane is a standard liquid that is used for octane number tests but unfortunately, it is a very poor knock resistance and is thus assigned a value of 0. While iso-octane which is also called 2,2,4-trimethylpentane is a very good knock resistance and is assigned a value of 100. So the answer is B.
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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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