Recall: Polar molecules: has a net dipole
Nonpolar molecules: no net dipole (dipoles cancel out or has nonpolar bonds)
Drawing the Lewis structure + dipole arrows of each:
Note: EN of C = 2.5; EN of H = 2.2
EN of F = 4.0; EN of Cl = 3; EN of Br = 2.8
All of the given has tetrahedral geometry.
Rank the following in order of increasing polarity: CH2Br2, CF2Cl2,CF2Br2, CBr4.
A. CBr4 < CH2Br2 < CF2Cl2 < CF2Br2
B. CH2Br2< CF2Cl2 < CF2Br2 < CBr4
C. CBr4 < CH2Br2 < CF2Br2 < CF2Cl2
D. CBr4 < CF2Br2 < CF2Cl2 < CH2Br2
E. CH2Br2< CF2Br2 < CF2Cl2 < CBr4