BRAINCAKEReforming
Reforming converts straight-chain alkanes into branched alkanes and cyclic hydrocarbons, including arenes. It is usually done by heating the alkanes with a platinum catalyst.
Straight-chain alkanes burn less efficiently in car engines and can ignite too early, causing knocking. Branched and cyclic hydrocarbons burn more smoothly, so reforming improves the quality of petrol.
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