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

(a) α-methyl naphthalene

(b) n-hexane

(c) iso-octane

(d) cetane molecule

I had been asked this question during an interview.

This intriguing question comes from Octane and Cetane Number in portion Fuels and Combustion of Engineering Chemistry II

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The correct option is (d) cetane molecule

The best I can explain: Cetane, C16H34, is a saturated hydrocarbon that has a very short ignition lag as compared to any commercial diesel fuel. Its cetane number is 100. Cetane number is the percentile of cetane in a mixture of cetane and α-methyl naphthalene.

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