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Branched alkanes produce less knocking compared to straight-chain alkanes because their molecular structure allows for more efficient combustion within the engine. The branching reduces the likelihood of premature ignition, as branched alkanes have higher octane ratings, meaning they can withstand greater pressure and temperature before igniting. This leads to smoother combustion and less engine knock, enhancing performance and efficiency. Additionally, the irregular shape of branched alkanes disrupts the formation of shock waves that contribute to knocking.

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