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4 Nov 2021

Given information

Here the given molecules are:

Step-by-step explanation

Step 1.

a

The molecular geometry of is pyramidal. In , fluorine is more electronegative than phosphorus. Three fluorine atoms are arranged below the phosphorus atom. One lone pair of electrons is present on the phosphorus atom. The direction of the net dipole moment of three fluorine atoms is opposite to that of the lone pair of electrons, but, they do not cancel each other because their magnitudes are different. Hence,  is polar.

 

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