Question

Q. Which of the following molecule is polar?
1. PF3Cl2
2. PCl5
3. PCl3F2
4. XeF4

Answer 1

Answer:

pcl5 might be a polar molecule

Answer 2

Answer:

The correct answer is $\bold{(A)PF_{3}Cl_{2}}$.

Phosphorus trifluoride dichloride $\bold{(PF_{3}Cl_{2})}$ is Polar in nature.

Explanation:

Phosphorus trifluoride dichloride has a $\bold{sp^3d}$ hybridization with trigonal bipyramidal geometry. In $\bold{sp^3d}$ hybridization, the most electronegative atom occupy the axial positions.

• Fluorine being more electronegative occupies the two axial positions. And the third fluorine occupies the equatorial position sharing a plane with two chlorine atoms.

• Here, two fluorines in the axial positions cancel out each other, but the planer atoms create polarity in the compound.

The asymmetric structure and dissimilarity between the polarity of planer atoms result in a net dipole towards fluorine.

Therefore the compound $\bold{PF_{3}Cl_{2}}$ is polar.