A) Aromatic hydrocarbons
B) Olefins
C) Branched chain paraffins
D) Straight chain paraffins
Correct Answer: D
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.
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