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Question

The octane number has zero value for:

A
iso-octane
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B
n-octane
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C
n-heptane
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D
tetraethyl lead
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Solution

The correct option is C n-heptane
n-heptane is defined as the zero point of the octane rating scale. 2,2,4-Trimethylpentane has an octane rating of 100, whereas n-heptane has an octane rating of 0. The octane number is based on an arbitrary scale which is a measure of its ability to resist knocking, as it burns on combustion.

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