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What are the best anti knocking reagents of petrol?

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What are the best anti knocking reagents of petrol?

(a) straight chain alkanes

(b) straight chain alkenes

(c) alkynes

(d) aromatics

This question was posed to me in an interview for job.

This is a very interesting question from Cracking and Knocking of Petroleum topic in chapter Fuel Technologies of Applied Chemistry

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The correct answer is (d) aromatics

To elaborate: The straight chain compounds cause maximum petrol knock and aromatics are called the best anti knock agents of petrol.

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