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Which of the following has the highest cetane number?

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Which of the following has the highest cetane number?

(a) n-heptane

(b) n-hexane

(c) n-pentane

(d) n-butane

I had been asked this question in an internship interview.

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

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Correct choice is (a) n-heptane

Explanation: n-heptane has maximum branched atom due to which it has the highest cetane number of all. This fuel is good for diesel engines.

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