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Why are lead compounds added in petrol?

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Why are lead compounds added in petrol?

(a) Reduce knocking

(b) Reduce HC emission

(c) Reduce exhaust temperature

(d) Increase power output

I had been asked this question during an online exam.

I'm obligated to ask this question of Engine Emissions in chapter Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

1 Answer

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Right choice is (b) Reduce HC emission

For explanation: The lead compounds are added in petrol to reduce the HC emission. The additive TEL (Tetraethyl Lead) was added to increase the octane number. The resulting lead in the engine exhaust was a poisonous pollutant.

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