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Which compound is usually added to decrease the knocking in the engine?

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in Engineering Chemistry II by (789k points)
Which compound is usually added to decrease the knocking in the engine?

(a) Sulphur

(b) Phosphorous

(c) Tetra ethyl lead

(d) Vanadium penta-oxide

The question was posed to me during an interview.

This question is from Anti Knocking Agents in division Fuels and Combustion of Engineering Chemistry II

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Right option is (c) Tetra ethyl lead

The best explanation: The anti-knocking properties of gasoline are usually increased by adding tetra ethyl lead and the process is called as doping. The molecular formula of tetra ethyl lead is Pb(C2H5)4 .

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