1.

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 paraffinsThe 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

Answer»

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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