Antiknocking agent of unleaded petrol is

Dibromomethane

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Methyl-ethyl ether

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Propane

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Methyl tert. butyl ether

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Solution

The correct option is D Methyl tert. butyl ether
Unleaded petrol is not doped with lead so it has a high knocking ability. It means it can be ignited before the actual ignition spark occurs. This is harmful to the engines. Lead is not used because it has shown severe adverse effects on the environment. Instead, methyl tertiary butyl ether is added which is easily miscible with petrol. However, it also has shown the carcinogenic properties.
Hence, the correct answer is 'Methyl tertiary butyl ether'.

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Q. The antiknock agent added to unleaded petrol is

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