Need chemistry help with van der Waals forces

1 what substance has the strongest (london) dispersion forces
Br2
l2
F2
Cl 2
2 which substance would have the highest melting point based on electronegativity
H2 Se
H2O
H2Te
H2S
3 hydrogen bonds can be found between molecules of which of the following substances
H2
NH3
Hl
CH4
4 which of the following intermolecular forces is responsible for iodine being a solid at room temperature
dipole-dipole forces
ion-dipole forces
dispersion forces
hydrogen bonds

< a href="/order">