Question

Which of the following Van der Waals forces would have the most action among molecules of methane. CH4

a. diapole-diapole
b. ion-diapole
c. hydrogen-diapole
d. London dispersion

Answer 1

Answer:- d. London dispersion

Explanations:- Dipole-dipole forces of attraction are present in polar covalent molecules. methane is not a polar molecule so the option is not correct.

Ion-dipole forces are present in ionic compounds. Methane is not an ionic compound so second option is also not correct.

Hydrogen bond is present in polar covalent molecules in which hydrogen is bonded to more electron negative(N, O or F)atom. So, third option is also not correct as the hydrogen is bonded to less electron negative carbon atom.

Methane is a non polar molecule and non polar molecules have weakest dispersion forces that are known as London dispersion forces.

So, the fourth option, d. London dispersion is the correct one.

Answer 2

Answer is: d) London dispersion.
Fritz Wolfgang London (1900 – 1954) was a German physicist.
The London dispersion force is the weakest and temporary attractive intermolecular force.
Atoms of one molecule induce temporary dipole at another molecule, so this force is also called - an induced dipole-induced dipole attraction