Which statement best describes a bronsted-lowry base?
a) it must accept protons to form a conjugate base.
b) it must accept protons to form a conjugate acid.
c) it must donate protons to form a conjugate base.
d) it must donate protons to form a conjugate acid.

Option B

Bronsted-Lowry base is defined as an proton or hydrogen ion acceptor.

For example:

Here, is a Bronsted-Lowry base because it can accept proton or hydrogen ion from .

Acid forms conjugate base and base forms conjugate acid, since,  is a base thus, it forms   as conjugate acid.

Thus, a Bronsted Lowry base must accepts a proton to form conjugate acid and option B is correct.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.