Which of the following compound is considered for calculating the octane number?

A) n-heptane B) n-hexane
C) iso-octane D) iso-butane
Answer & Explanation Answer: C) iso-octane

Explanation: The octane number of a fuel is numerically taken as the percentage of iso-octane in a mixture of iso-octane and n-heptane. The octane number of iso-octane is 100 and of n-heptane is 0.

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