Question

How is a polar compound related to hydrophilic and hydrophobic interactions?

Answer 1

Hint: A polar compound is a compound which consists of two dipolar units having opposite charges. The term hydrophilic stands for water liking and the term hydrophobic stands for water disliking.

Complete step by step answer:
The polar compounds are those compounds which have distinct differences of positive and negative charges. The bonds between these compounds are purely ionic in nature. On dissolution of these compounds they dissociate into cations and anions.
The hydrophilic compounds are the ones which are strongly water liking systems. That means when such compounds are allowed to come in contact with hydrophilic systems the compounds feel strong attraction forces.
The hydrophobic compounds are the ones which are strongly water disliking systems. That means when such compounds are allowed to come in contact with hydrophobic systems the compounds feel strong repulsion forces.
A theory is given by the researchers for the interactions of polar compounds with hydrophobic and hydrophilic systems. The polar compounds possess three types of interactions with hydrophilic compounds which are named as hydrogen bonding, dipole-dipole and London-dispersion forces.
On the other hand the polar compounds interact with the hydrophobic compounds by only weak London-dispersion forces.
As for example ethanol is hydrophilic in nature as it involves hydrogen bonding, dipole-dipole and London dispersion forces with water molecules. However hexane is a hydrophilic solvent which interacts with water by London-dispersion forces.

Note: The hydrophilic is remembered as ‘hydro’ means water and ‘philic’ means like. The hydrophilic and hydrophobic interactions are important in several areas. It is vastly used in medicinal chemistry for drug administration. The structure of drug molecules is modified by inserting hydrophilic and hydrophobic substituents to cross several membranes of the body.