Which of the following has lower vapor pressure?

Explanation

Correct option is A. Vapor pressure depends upon the molecules that bond well and the forces of attraction of mercury metal atoms are quite strong. So, with the help of this relation we are able to find the lowest vapor pressure. Vapor pressure can be explained as: the pressure exerted by the gaseous form of liquid on the liquid itself when both are in equilibrium or in other words we can say that it is the ability of a compound to bond with itself. Compound molecules that bond well with each other will have low vapor pressure whereas poorly bonded compounds will have high vapor pressure. The temperature at which the vapor pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is known as the boiling point of the liquid. There are three common factors which influence the vapor pressure are surface area, intermolecular forces and temperature. At different temperatures different molecules have different vapor pressure. Vapor pressure increases with increase in temperature The forces between the individual metal atoms of mercury are quite strong as compared to the cohesive molecular forces such as hydrogen bonding which is present in the case of alcohols, ethers and water. Other options B C and D are wrong as values of vapor pressure of different substances are given below :