Which of the following has the least octane number?

Octane

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Cetane

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2,2,4-trimethyl pentane

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n-heptane

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Solution

The correct option is D n-heptane
Octane number for straight chain alkanes is lower than their branched isomers. As branching increases octane number increases. n-heptane has an octane number of zero and iso octane has an octane number of 100.

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