Polar and non polar molecules

• A symmetric molecule (all bonds identical and no lone pairs) will not be polar even individual bonds within the molecular Are polar
• What is a symmetric molecule

  All bonds identical and no lone pairs
• The individual dipoles on the bonds cancel out due to the symmetrical shape of the molecule. There is no NET dipole moment the molecule is NON POLAR e.g CCl4 will be non-polar whereas CH3Cl will be polar
• O=C=O - CO2 is a symmetrical molecule and is non-polar molecule