Q.

Which of the following is used to increase the anti-knocking property of petrol?

A. Tetramethyl lead
B. Tetraethyl lead
C. nimethyl lead
D. Triethyl lead
Answer» B. Tetraethyl lead
Explanation: An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel's octane rating by raising the temperature and pressure at which ignition occurs. Tetraethyllead was admixed with gasoline (petrol) beginning in the 1920s as an inexpensive octane booster which allowed engine compression to be raised substantially, which in turn increased vehicle performance and fuel economy.
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