Which of the following has an octane number of zero?
- AIso-octane
- BNeo-octane
- Cn-octane
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (e) None of the above
Explanation
On the octane scale, n-heptane is set at 0 and iso-octane (2,2,4-trimethylpentane) at 100.
n-Octane knocks badly, with an octane number of about −20, but it is not zero. Since n-heptane is not among the options, the answer is "None of the above".