IntermolecularForcesWhich one of the following substances has dispersion forces as theonly intermolecular force?Question 1Select one:a.CH3OHb.NH3c.H2Sd.Kr

The answer is d. Kr.

Here's why:

Intermolecular forces are the forces of attraction between molecules. They are weaker than the intramolecular forces (the forces holding a molecule together) such as the covalent or ionic bonds.

There are three types of intermolecular forces:

1. Dispersion forces (also known as London forces)
2. Dipole-dipole forces
3. Hydrogen bonding

Dispersion forces are the weakest intermolecular force and are present in all molecules, whether they are polar or nonpolar.

Now, let's look at the options:

a. CH3OH (Methanol) - This molecule has hydrogen bonding because it contains a hydrogen atom bonded to oxygen, which is a highly electronegative atom.

b. NH3 (Ammonia) - This molecule also has hydrogen bonding because it contains a hydrogen atom bonded to nitrogen, another highly electronegative atom.

c. H2S (Hydrogen sulfide) - This molecule has dipole-dipole forces because it is a polar molecule (it has a positive end and a negative end).

d. Kr (Krypton) - This is a noble gas and exists as individual atoms rather than molecules. Therefore, the only intermolecular force it can have is dispersion forces.

So, the only substance that has dispersion forces as the only intermolecular force is Kr (Krypton).