Tetra ethyl lead is used as anti knocking agent for petrol.What is meant by anti knocking agent ?

The compounds that  are added to increase the efficiency of fuel by preventing the incomplete combustion of carbon chain  and knocking. Such substances are known as anti-knocking agents. It also tends to decrease the evolution of pollutant by preventing incomplete combustion.
Example :
Pb(C2H5)4 is added to gasoline as antikonking substance

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