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Question

The chemical added to leaded petrol to prevent the deposition of lead in the combustion chamber is

A
Iso-octane
B
Tetraethyl lead
C
n-Heptane
D
Ethylene dibromide
E
Mercaptan
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Solution
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Correct option is B. Ethylene dibromide
$$ Pb(C_2H_5) _4 \xrightarrow[]{heat} Pb+4CH_3CH_2 $$
$$BrCH_2CH_2Br+Pb\rightarrow CH_2=CH_2+PbBr_2$$
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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