Gasoline is obtained from crude petroleum oil by its

In the differential extraction method using a separating funnel,two layers are formed. What is the difference in the mixture before shaking the solution and at the end of the process?

Which two organic compounds are purified by the sublimation technique?

$A$ flask contains a mixture of isohexane and $3-$methylpentane. One of the liquids boils at $63^{\circ}C$ while the other boils at $60^{\circ}C$. What is the best way to separate the two liquids and which one will be distilled out first?

Which apparatus is used to reduce pressure in distillation under reduced pressure?

Which of the following organic compounds could not be dried by anhydrous $CaCl_{2}$?