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  4. Which of the following has highest knocking property?

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Q. Which of the following has highest knocking property?

CMC MedicalCMC Medical 2008

Solution:

Knocking character of fuels is increased with decrease in octane number. The octane number increase in the order straight chain alkanes < branched chain alkanes < olefins < cycloalkenes < aromatic compounds Since, straight chain alkanes have minimum octane number, hence they produce maximum knocking.