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Olefins have higher anti-knocking properties than the corresponding ______________

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Olefins have higher anti-knocking properties than the corresponding ______________

(a) Paraffin

(b) Benzene

(c) Toluene

(d) Nitrobenzene

I had been asked this question in a national level competition.

I'd like to ask this question from Knocking topic in portion Fuels and Combustion of Engineering Chemistry II

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Right choice is (a) Paraffin

For explanation I would say: The anti-knocking tendency increases as the position of a double bond approaches the centre of the chain. Paraffin consists of a single bond and are straight chained due to which they are less anti-knocking then olefins.

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