1.

The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamber isA. Iso-octaneB. Ethylene dibromideC. Tetraethyl leadD. Mercaptan

Answer» Correct Answer - B
`Pb(C_2H_5)_4overset"heat"to Pb+underset"Ethyl radical"(4CH_3CH_2)`
`undersetunderset(Br)(|)(CH_2)-undersetunderset(Br)(|)(CH_2)+Pbto underset"Ethene"(CH_2=CH_2)+underset"Lead bromide"(PbBr_2)`
As leaded gasoline burns, lead metal gets deposited in the engine which is removed by adding ethylene dibromide. The lead bromide is volatile and is carried off with the exhaust gases from the engine.


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