Assertion :Tetraethyl lead is used to increase the octane number of gasoline. Reason: It acts as negative catalyst and slows down the combustion of gasoline.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Tetraethyl lead is used to increase the octane number of gasoline because the bond between lead atoms and ethyl group are broken. Upon combustion, the lead form lead oxide ( $P b O$ ), which prevents fraction of fuel from burning too quickly. Due to this engine compression to be raised, so it acts as negative catalyst and increase the octane number of gasoline.

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