Question

Why is cresyl diphenyl phosphate added with petrol?

(a) To increase the inductance period of the engine

(b) To decrease the electrical conductivity of lead compounds

(c) To increase the electrical conductivity of lead compounds

(d) To decrease the inductance period of the engine

This question was posed to me during an interview for a job.

The doubt is from Anti Knocking Agents topic in chapter Fuels and Combustion of Engineering Chemistry II

Answer 1

Correct choice is (b) To decrease the electrical conductivity of lead compounds

Best explanation: Due to high traffic in cities, sometimes lead is not removed properly by ethylene dibromide. Due to this condition cresyl diphenyl phosphate is added with petrol, so that it can reduce the electrical conductivity of the lead compounds deposited on the spark plug points.