Question

What is the octane number of $ n - $ nonane?
 $ (a){\text{ 0}} $
 $ (b){\text{ - 20}} $
 $ (c){\text{ 100}} $
 $ (c){\text{ }}more{\text{ than 100}} $

Answer 1

Hint: Octane number is generally used to measure the antiknock properties of the fuel which is used in the motor. It represents the knock resistance of the gasoline. It can vary from zero to hundred $ (0 - 100) $ . Depending on the octane number we grade the quality of a particular fuel.

Complete answer:
On the combustion of carbon there is a large amount of heat produced which can be used for various purposes like cooking food, as a fuel in motor vehicles and many others. Therefore the organic compounds are used as fuel because they produce a large amount of energy. Hence we have a number which will tell us about the grade of the fuel. The number is known as the octane number. This is also known as the Antiknock rating. It is a measure of the ability of a fuel to resist the effect of knocking when ignited with air inside the cylinder of internal combustion. There are certain standard conditions which will decide the octane number of every compound which is used as fuel. Therefore we can say that octane number is the rating of fuels based upon the anti-knocking capability of a particular fuel. Therefore based on the standards the octane number of $ n - $ nonane is $ - 20 $ .

Note:
Octane rating a fuel defines the behaviour of the fuel inside the engine during its combustion. The octane number of any fuel can be increased by adding some oxygenates like ethanol, tertiary butyl formate and others. The higher the octane number, more compression required for the fuel ignition. Hence it is a measure of the quality of gasoline fuel.