Discussion
Tetraethyl lead was used as an anti-knock agent but has been abandoned because it
Answer: C
Correct answer: poisons catalytic converters and is toxic
Tetraethyl lead is an extremely effective anti-knock additive, so it was not abandoned for lack of performance. It was abandoned because lead is a cumulative neurotoxin dispersed along every road, and because it destroys the noble metal catalyst in a catalytic converter, making the fuel incompatible with modern emission control. Octane is now raised by reforming, isomerisation and oxygenates instead.
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