IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

rim_ank_pal

how can we know if a molecule is polar or non- polar?

fwks_phoenix

The difference in electronegativity between the two atoms that form the molecule helps us identify the polar nature... the diff. in electronegativity should b greater than 2 or 3....

bhuvana89

A non-polar molecule has no net dipole.
This can be achieved by the molecule having:

only non-polar bonds
polar bonds arranged symmetrically so that the dipoles cancel out

A polar molecule has a net dipole.
This is achieved in the molecule by the molecule being made up of polar bonds arranged unsymmetrically so that the dipoles do not cancel out

chem4884

for this u must draw the structure of the molecule.....& consider comparative electronegativity of bonded elements....

....as dipole moment is a vector qantity , so dimention ie arrangement of grps is very imp

BeCl2 ,BCl3 , CH4,CCl4,C6H6.....are nonpolar due to there symmetric arrangement.....

CHCl3,CH2Cl2,NH3,NF3....are polar

aravindh_ramaswamy

If the electronegativity difference between two atoms in a molecule(X) >1.7,

the molecule is predominantly ionic.

if X=1.7,the molecule is 50%covalent and 50%ionic.

and if X<1.7,The molecule is predominantly covalent.

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