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Efficiency of Fuel

Which of the ...

Question

Which of the following has highest octane number

A

n-hexane

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B

n-heptane

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C

iso-octane

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D

n-heptane and iso-octane mixed in ratio

50 : 50

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Solution

The correct option is C iso-octane
An aromatic compound has the highest octane number. The octane number of aromatic hydrocarbons are exceptionally high. Note: In case of straight chain hydrocarbons, octane number decreases with increase in the length of the chain. Branching of chain increases the value of octane number.
Hence option C $i s o - o c t a n e$ is correct ans.

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