Question

Gasoline is a mixture of?
A.${{\text{C}}_3} - {{\text{C}}_5}$ alkanes
B.${{\text{C}}_{15}} - {{\text{C}}_{20}}$ alkanes
C.${{\text{C}}_{11}} - {{\text{C}}_{15}}$ alkanes
D.${{\text{C}}_7} - {{\text{C}}_9}$ alkanes

Answer 1

Hint: The refined form of petroleum which is used as fuel for internal combustion engines is known as gasoline. Gasoline is a flammable liquid.

Complete step by step answer:
A mixture of a large number of different hydrocarbons is gasoline. The exact composition of gasoline is not defined.
Gasoline is a mixture of alkanes, alkenes and cycloalkanes.
Gasoline consists of a homogeneous mixture of lightweight alkanes that have \[{\text{7}}\] to \[{\text{9}}\] carbon atoms per molecule.
Thus, gasoline is a mixture of ${{\text{C}}_7} - {{\text{C}}_9}$ alkanes.
Therefore, the correct option is D.

Additional Information:
The ratio of molecules in gasoline depends on:
Set of processing units
Crude oil feed
Grade of gasoline
The different types of gasoline are:
Straight run gasoline: Straight run gasoline is distilled directly from the crude oil. It is low in aromatic content and contains no olefins.
Reformate: The aromatic content of reformate is very high and the olefin content is low.
Catalytic cracked gasoline: The catalytic cracked gasoline has high olefin content and moderate aromatic content.
Hydrocrackate: The hydrocrackate has moderate aromatic content.
Alkylate: The alkylate has no aromatic content and no olefin content but has high MON.
Isomerate: The isomerate has no aromatic content and no olefin content has medium RON and MON.


Note:
The density of gasoline is lower than that of water. Thus, gasoline floats on water. If stored properly, gasoline remains stable for six months. But if gasoline is stored over time it breaks down into its separate components.