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Which of the following order of petrol knocking is true?

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Which of the following order of petrol knocking is true?

(a) aromatics > branched paraffins > olefins > cyclo paraffins > aromatics

(b) straight chain paraffins > olefins > branched paraffins > cyclo paraffins > straight chain paraffins

(c) straight chain paraffins > branched paraffins > olefins > cyclo paraffins > aromatics

(d) straight chain paraffins > branched paraffins > olefins > aromatics > cyclo paraffins

The question was asked in exam.

I'm obligated to ask this question of Cracking and Knocking of Petroleum topic in chapter Fuel Technologies of Applied Chemistry

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Correct option is (c) straight chain paraffins > branched paraffins > olefins > cyclo paraffins > aromatics

For explanation I would say: The order of petrol knocking is given by straight chain paraffins > branched paraffins > olefins>cyclo paraffins > aromatics. As we know that aromatics are the best anti knock agents so, the petrol knock for them is very low.

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