Octane number can be changed by :

alkylation

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cyclisation

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isomerisation

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All of these

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Solution

The correct option is A All of these
All the three reactions, i.e. alkylation, cyclisation, and isomerisation convert straight-chain hydrocarbons to branched-chain or cyclic compounds, which changes the percentage of straight-chain hydrocarbon.

Hence, the octane number is changed.

So, the correct option is D.

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