Which of the following has the highest octane number?

Question: Which of the following has the highest octane number?

A. n-hexane

B. n-heptane

C. n-pentane

D. 2,2,-4-trimethyl pentane

Octane number is a measure of a fuel's ability to resist "knocking" or "pinging" during combustion, which is an undesirable process that can damage engine components. Higher octane numbers indicate better performance in this regard.

Among the options given, 2,2,4-trimethylpentane (also known as isooctane) has the highest octane number. In fact, it is used as the reference standard for the octane rating scale, with an octane number of 100. This means that isooctane has excellent anti-knock properties, and can be used to improve the quality of lower-octane fuels.

On the other hand, n-hexane, n-heptane, and n-pentane have octane numbers of 0, which means they are very poor fuels in terms of anti-knock properties. These straight-chain hydrocarbons have a tendency to detonate prematurely during combustion, leading to knocking and reduced engine performance.

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