Question

The structure of ethanol(CH4)) shows that molecule was O-H bond. What is the strongest intermolecular attractive force it can form?
A. Hydrogen bonds
B. Dispersion
C. Dipole-dipole

Answer 1

Ethanol has C-OH bond which is the polar bod due to the electronigativity difference between C and O. Oxygen being more electronegative pulls electron density towards it self from the sigma bond between C and O. Thus oxygen becomes pratial electronegative also O-H bond is also polar where again Oxygen becomes more electronegative and in result H becomes partial positive charged. Thus, pratial positively charged H attracts electron desity from other molecules pratial negatively charged oxygen to form intermolecular hydrogen bonding, which is the most strongest attractive force between molecules of ethanol. Hence, the answer is A, hydrogen bonding.

Dipole-Dipole interactions are less stronger as compared to hydrogen bonding. This happens when polar compounds are attracted to one another.

Dispersion: These are the weakest "London Dispersion Forces". This takes place when temporary dipoles on nonpolar molecules attract one another where there is no definite position of electrons overtime.