Question

The given graph shows the vapor pressure curves for some liquids. Liquids $A,B,C$ and $D$ respectively are:

• A. diethyl ether, acetone, ethyl alcohol, water
• B. acetone, ethyl alcohol, diethyl ether, water
• C. water, ethyl alcohol, acetone, diethyl ether
• D. ethyl alcohol, acetone, diethyl ether, water

Answer 1

The correct option is A diethyl ether, acetone, ethyl alcohol, water

Vapour pressure is inversely proportional to the intermolecular forces between molecules.

The intermolecular forces for the following compounds is in the following order.

$\text{diethyl ether}>\text{acetone}>\text{ethyl alcohol}>\text{water}$

Water has highest intermolecular forces due to hydrogen bonding. Hence the vapour pressure follows the order as given below.

$\text{diethyl ether}>\text{acetone}>\text{ethyl alcohol}>\text{water}$