###### Question

Which of the following substances have polar interactions (dipole-dipole forces) between molecules? F2, Cl2, ClF, NF3

# Solution: Which of the following substances have polar interactions (d...

Since we are looking for polar interaction between molecules, we need to find polar molecules. We know that when we have compounds made up of the same element, those will be non-polar compounds because the same elements will share electrons equally and will not produce any dipole moments. This means that $F_2$ and $Cl_2$  are non-polar.

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