Question

Which of the following molecules are polar: $O{F}_2,HF,S{O}_3$ ?

• A. All except $S{O}_3$
• B. Only $HF$
• C. Only $HF$ and $O{F}_2$
• D. None of these

Answer 1

The correct option is A All except $S{O}_3$

Symmetrical molecules generally do not posses net dipole moment. As opposite dipole moments cancel each other and the net dipole moment of molecule is zero.

$O{F}_2$:
Structure of $O{F}_2$ is non- planar
Hybridisation $\Rightarrow s{p}^3$
Geometry $\Rightarrow$ tetrahedral
Structure $\Rightarrow$ Bent
Hence , it contains 2 lone pairs.


Hence, it posses permanent dipole and is a polar molecule.


$HF$ $\Rightarrow$ linear

As the bond between H and F is polar, HF is a polar molecule

$S{O}_3:$
Planar and symmetrical, hence, it does not posses any net dipole moment and is non polar.