Which of the following has the highest octane number ?
Correct answer: A. Aromatics
- A. Aromatics
- B. i-paraffins
- C. Naphthenes
- D. Olefins
Explanation
Aromatics generally have the highest octane numbers because their stable ring structures resist knocking in spark-ignition engines. Isoparaffins also have good antiknock quality, but usually rank below aromatics.
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