1.

The increasing order of octane number is -

Answer»

n-ALKANE `LT` BRANCHED alkane `lt` CYCLOALKANE `lt` aromatic hydrocarbon
aromatic hydrocarbon `lt` cycloalkane `lt` branched alkane `lt` n-alkane
cycloalkane `lt`branched alkane `lt` aromatic hydrocarbon `lt` n-alkane
aromatic hydrocarbon `lt` cyloalkane `lt` n-alkane `lt` branched alkane

Answer :A


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