# Molecular Geometry & Bonding Theories

Polarity of the bond depends on the ability of one atom to attract the electrons of the bonds towards it more than the other atom.

Which is based on the difference in electronegativity between the two atoms making the bond.

A polar molecule does not necessarily contain polar bonds
It is possible for a molecule to contain polar bonds, but not to be polar.

### Example: CO2 molecule

In a CO2 molecule, C−O bond is polar, so both C−O bonds in CO2 are polar, but CO2 is not a polar molecule.

What is the reason behind this?
# e domains around C = 2; the molecule has a linear geometry.
The two dipoles are opposite to each other along the same line; they cancel each other.

### Example: H2O molecule

 In a H2O molecule; # e domains around O = 4; hence not linear. Bond dipoles DO NOT cancel each other. So, H2O is a POLAR molecule.
Hence, overall polarity of the molecule depends on its molecular geometry.

### Exercises on Molecular Shape and Molecular Polarity

Exercise I on Molecular Shape and Molecular Polarity

Check your answers here: Solution to the Exercise I on Molecular Shape and Molecular Polarity

Exercise II on Molecular Shape and Molecular Polarity

Check your answers here: Solution to the Exercise II on Molecular Shape and Molecular Polarity