Dear student,

A polar molecule is a molecule that has a net dipole moment due to its having unsymmetrical polar bonds. 
 There are two factors that go into determining if a molecule is polar  or not. To determine if a molecule (or ion) is polar or non-polar, you  must determine both factors. 
 1) The polarity of the individual bonds in the molecule; 
 2) The shape or geometry of the molecule. 

 First, to determine if a given individual bond is polar, you need to  know the electronegativity of two atoms involved in that bond.  If the  electronegativity of the two atoms has a difference of 0.3 or less, then  the bond is non-polar. If the electronegativity difference is greater  that 0.3 but less than 1.7, then the bond is polar. If the two values  have a difference greater than 1.7, then the bond is ionic, which is  just very very polar. 
  




























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dear chilukuri kartik ,
                            a molecule is said to be polar if there exist a net dipole moment ...
for example if we take CCl4 then it containes 4 polar bonds but this molecule is not polar
coz its shape is regular tetrahedral & so all four dipole moment vectors cancel each other ...
so  dipole moment is a necessary condition for a molecule to be polar...
						

							
any molecule or compound soluble in polar solvents such as water is a polar molecule whereas a molecule soluble in non-polar solvents such as carbon disulphide is a non-polar molecule