Which one of the following molecules would be most polar?
(a) hf
(b) hi
(c) hbr
(d) hcl and h2

This question is quite a controversial one, because three of the options represented above are very similar, but due to the fact that there is a HF, which is even more polar that water, it is getting clear. So, the right answer is definitely the first option, because HF belongs to acids that are very polar compounds.

Ionic compounds dissociate into component ions dissolved into a solution creating substances called "electrolytes".hope my answer has you : )