Question

Ethylene has high b.p and high vapour pressure at \[100^\circ {\rm{C}}\] and does not dissolve in water. Hence, ethylene is separated by this method
A) Simple distillation
B) Vacuum distillation
C) Vapour distillation
D) Alkali treatment

Answer 1

Hint: Distillation defines the method used for the separation of components of liquid that are miscible in nature. Miscible liquids are those mixtures where one liquid is completely dissolved in the other liquid.

Complete Step by Step Solution:
Let's understand the method of distillation in detail. This method is useful in the separation of components of such miscible liquid that on boiling results no decomposition and has a huge difference in boiling points of them. To separate acetone from water, the use of this separation technique is significant.

Let's discuss the method of vapour distillation in detail. This method is useful in separating substances that are immiscible in water. And they are volatile and possess very high vapour pressure at the boiling point temperature. This method of distillation is useful in purifying liquids whose decomposition takes place at the boiling point.

Here, given that, ethylene has a high boiling point and very high pressure at the temperature of \[100^\circ {\rm{C}}\]. So, vapour distillation is a suitable method to separate ethylene.
Hence, option C is right.

Note: The technique of vacuum distillation is used to separate components of a mixture by reducing the pressure. In this method separating components are done for those that have a very high boiling point which is difficult to achieve. The reduction of pressure results in a lower boiling point of the components.