Question

how tetra ethyl lead reduse knocking

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Answer 1

$\huge\blue{\mid{\underline {\overline{\tt ❥Ꭺɴꮪꮃꭼꭱ♡}}\mid}}$

In 1922, an American called Thomas Midgely (who also invented CFCs) found that if tetraethyl lead, Pb(CH2CH3)4, was put into petrol, particles of lead and lead oxide PbO are formed on combustion. This helps the petrol to burn more slowly and smoothly, preventing knocking and giving higher Octane ratings.

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