Question

What is the strongest intermolecular force in a sample of butanoic acid, and why?

H H H O
. . . ..
H .C .C. C .C .O.H
. . .
H H H
Is this structure right?

Answer 1

You didn't list any choices but I assume hydrogen bonding is one of the choices. That should be the strongest IMF.
You see you can't do spaces on the board. If you want butanoic acid, it is here.
http://en.wikipedia.org/wiki/Butyric_acid