Multiple choice

By isomerisation of straight chain hydrocarbons, the octane number generally

  1. increase<font size="2">s</font>

  2. decrease<font size="2">s</font>

  3. remains constant

  4. cannot be d<font size="2">efined</font>

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A Correct answer
Explanation

Isomerisation converts straight-chain alkanes to branched isomers. Branched hydrocarbons have higher octane numbers because they resist knocking better in combustion engines.