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

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in Engineering Chemistry II by (789k points)
Which of the following compound is considered for calculating the octane number?

(a) n-heptane

(b) n-hexane

(c) iso-octane

(d) iso-butane

The question was posed to me in unit test.

The question is from Octane and Cetane Number in portion Fuels and Combustion of Engineering Chemistry II

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Best answer
Right choice is (c) iso-octane

Easiest 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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