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  4. Which one of the following have lowest octane number ?

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Q. Which one of the following have lowest octane number ?

Hydrocarbons

Solution:

Straight chain alkanes have lower octane numbers than branched chain alkanes. Further, the value of octane number decreases with increase in length of carbon chain. Therefore, n-hexadecane $(C_{16}H_{34})$ has lowest octane number.