Chemical wth the largest intermolecular force (IMF): Co, Br2, Kr, Xe, NH3, He, H20, or CO2?

Question

Also,

What chemical has largest dipole-dipole and LDF IMF but no H-bonding?

and

What chemical has the weakest IMF?

THANKS!!!!

Answer 1

He has the weakest forces, and water the strongest (H-bonding).

CO2 and Br2 are both non-polar, but Br2 has much higher vdW forces than CO2.

If you meant CO rather than Co, that molecule is the only polar one in the list without H-bonding.

Answer 2

that is an interesting question