[gralla55]

A: Which is the strongest acid?

B: Which has the highest boiling point?

So in A the molecule with the highest inductive effect will be the strongest acid, and seeing as Fluorine is the most elegronegative the answer should be 4.

In B, 3 is the only molecule capable of forming hydrogen-bonds, and will therefore have the highest boiling point.

Does this look correct? Thanks!

[Schrödinger]

A : I wouldn't place my bet on IV, because it's not just electronegativity that matters. Look at the distance of the F atom from the acid group. Proximity of the -I group from the -COOH group will definitely have a considerable effect on acidity.

B : Actually, both II and III can form Hydrogen bonds, but III would be correct because of the greater number of H-bonds.

[nj_bartel]

I think "greater strength of the hydrogen bonds it makes" would be more accurate than "greater number of hydrogen bonds"