The octane number of zero is assigned to____________?
Correct answer: B. n-heptane
- A. 2-methyl octane
- B. n-heptane
- C. iso-octane
- D. 3-methyl octane
Explanation
The octane-number scale assigns 0 to n-heptane and 100 to iso-octane, or 2,2,4-trimethylpentane. Therefore option b is correct. Students may choose c because iso-octane is the other standard reference fuel, but it represents an octane number of 100, not zero.
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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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