Question

Which of the following is non-polar molecule?

• A. $BC{l}_3$
• B. $C{H}_{2}C{l}_2$
• C. $N{H}_3$
• D. $FNO$

Answer 1

The correct option is A $BC{l}_3$

If you look at the Lewis Structure for Boron Trichloride it appears to be a symmetrical molecule. However, to determine if$B{Cl}_3$ is polar we consider the molecular geometry. A polar molecule results from an unequal/unsymmetrical sharing of valence electrons. While there may be unequal sharing of electrons in the individual bonds, in a nonpolar moleculethese bonds are evenly distributed and cancel out. There is no net dipole and the $B{Cl}_3$ is non-polar.