Octane number of petrol can be improved by adding or mixing it With which of the following chemicals ?

E t_{4} P b

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C H_{3} O C (C H_{3})_{3}

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1-methyl naphthalene

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Pyrene

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Solution

The correct options are
B $E t_{4} P b$
C $C H_{3} O C (C H_{3})_{3}$
Octane rating of petrol can be imported by . adding small amounts of certain. compounds kown as anti-knock compounds, eg, tetraethyl lead (TEL). Such petrol is known as leaded petrol. Now a days methyl tert-butylether (MTBE) is also used to increase octane rating because its oxygen helps gasoline to bum more completely and optimises the oxidation during combustion.

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